diff --git a/reddit/message.go b/reddit/message.go
index 5c67701..173211b 100644
--- a/reddit/message.go
+++ b/reddit/message.go
@@ -81,16 +81,8 @@ type inboxThings struct {
 	Messages []*Message
 }
 
-// init initializes or clears the listing.
-func (t *inboxThings) init() {
-	t.Comments = make([]*Message, 0)
-	t.Messages = make([]*Message, 0)
-}
-
 // UnmarshalJSON implements the json.Unmarshaler interface.
 func (t *inboxThings) UnmarshalJSON(b []byte) error {
-	t.init()
-
 	var things []inboxThing
 	if err := json.Unmarshal(b, &things); err != nil {
 		return err
diff --git a/reddit/reddit.go b/reddit/reddit.go
index 17202f2..af698bd 100644
--- a/reddit/reddit.go
+++ b/reddit/reddit.go
@@ -78,6 +78,7 @@ type Client struct {
 	Stream     *StreamService
 	Subreddit  *SubredditService
 	User       *UserService
+	Wiki       *WikiService
 
 	oauth2Transport *oauth2.Transport
 
@@ -107,6 +108,7 @@ func newClient() *Client {
 	client.Stream = &StreamService{client: client}
 	client.Subreddit = &SubredditService{client: client}
 	client.User = &UserService{client: client}
+	client.Wiki = &WikiService{client: client}
 
 	postAndCommentService := &postAndCommentService{client: client}
 	client.Comment = &CommentService{client: client, postAndCommentService: postAndCommentService}
diff --git a/reddit/reddit_test.go b/reddit/reddit_test.go
index 746df69..13db3db 100644
--- a/reddit/reddit_test.go
+++ b/reddit/reddit_test.go
@@ -71,6 +71,7 @@ func testClientServices(t *testing.T, c *Client) {
 		"Stream",
 		"Subreddit",
 		"User",
+		"Wiki",
 	}
 
 	cp := reflect.ValueOf(c)
diff --git a/reddit/things.go b/reddit/things.go
index 2d1248c..213d695 100644
--- a/reddit/things.go
+++ b/reddit/things.go
@@ -6,19 +6,21 @@ import (
 )
 
 const (
-	kindComment    = "t1"
-	kindUser       = "t2"
-	kindPost       = "t3"
-	kindMessage    = "t4"
-	kindSubreddit  = "t5"
-	kindTrophy     = "t6"
-	kindListing    = "Listing"
-	kindKarmaList  = "KarmaList"
-	kindTrophyList = "TrophyList"
-	kindUserList   = "UserList"
-	kindMore       = "more"
-	kindModAction  = "modaction"
-	kindMulti      = "LabeledMulti"
+	kindComment          = "t1"
+	kindUser             = "t2"
+	kindPost             = "t3"
+	kindMessage          = "t4"
+	kindSubreddit        = "t5"
+	kindTrophy           = "t6"
+	kindListing          = "Listing"
+	kindKarmaList        = "KarmaList"
+	kindTrophyList       = "TrophyList"
+	kindUserList         = "UserList"
+	kindMore             = "more"
+	kindModAction        = "modaction"
+	kindMulti            = "LabeledMulti"
+	kindWikiPageListing  = "wikipagelisting"
+	kindWikiPageSettings = "wikipagesettings"
 )
 
 type anchor interface {
@@ -94,6 +96,10 @@ func (t *thing) UnmarshalJSON(b []byte) error {
 		v = new(trophyList)
 	case kindKarmaList:
 		v = new([]*SubredditKarma)
+	case kindWikiPageListing:
+		v = new([]string)
+	case kindWikiPageSettings:
+		v = new(WikiPageSettings)
 	default:
 		return fmt.Errorf("unrecognized kind: %q", t.Kind)
 	}
@@ -168,6 +174,19 @@ func (t *thing) Karma() ([]*SubredditKarma, bool) {
 	return *v, ok
 }
 
+func (t *thing) WikiPages() ([]string, bool) {
+	v, ok := t.Data.(*[]string)
+	if !ok {
+		return nil, ok
+	}
+	return *v, ok
+}
+
+func (t *thing) WikiPageSettings() (v *WikiPageSettings, ok bool) {
+	v, ok = t.Data.(*WikiPageSettings)
+	return
+}
+
 // listing is a list of things coming from the Reddit API.
 // It also contains the after/before anchors useful for subsequent requests.
 type listing struct {
@@ -263,21 +282,8 @@ type things struct {
 	Multis     []*Multi
 }
 
-// init initializes or clears the listing.
-func (t *things) init() {
-	t.Comments = make([]*Comment, 0)
-	t.Mores = make([]*More, 0)
-	t.Users = make([]*User, 0)
-	t.Posts = make([]*Post, 0)
-	t.Subreddits = make([]*Subreddit, 0)
-	t.ModActions = make([]*ModAction, 0)
-	t.Multis = make([]*Multi, 0)
-}
-
 // UnmarshalJSON implements the json.Unmarshaler interface.
 func (t *things) UnmarshalJSON(b []byte) error {
-	t.init()
-
 	var things []thing
 	if err := json.Unmarshal(b, &things); err != nil {
 		return err
diff --git a/reddit/wiki.go b/reddit/wiki.go
new file mode 100644
index 0000000..68fe76a
--- /dev/null
+++ b/reddit/wiki.go
@@ -0,0 +1,170 @@
+package reddit
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/google/go-querystring/query"
+)
+
+// WikiService handles communication with the wiki
+// related methods of the Reddit API.
+//
+// Reddit API docs: https://www.reddit.com/dev/api/#section_wiki
+type WikiService struct {
+	client *Client
+}
+
+// WikiPagePermissionLevel defines who can edit a specific wiki page in a subreddit.
+type WikiPagePermissionLevel int
+
+const (
+	// PermissionSubredditWikiPermissions uses subreddit wiki permissions.
+	PermissionSubredditWikiPermissions WikiPagePermissionLevel = iota
+	// PermissionApprovedContributorsOnly is only for approved wiki contributors.
+	PermissionApprovedContributorsOnly
+	// PermissionModeratorsOnly is only for moderators.
+	PermissionModeratorsOnly
+)
+
+// WikiPageSettings holds the settings for a specific wiki page.
+type WikiPageSettings struct {
+	PermissionLevel WikiPagePermissionLevel `json:"permlevel"`
+	Listed          bool                    `json:"listed"`
+	Editors         []*User                 `json:"editors"`
+}
+
+// WikiPageSettingsUpdateRequest represents a request to update the visibility and
+// permissions of a wiki page.
+type WikiPageSettingsUpdateRequest struct {
+	// This HAS to be provided no matter what, or else we get a 500 response.
+	PermissionLevel WikiPagePermissionLevel `url:"permlevel"`
+	Listed          *bool                   `url:"listed,omitempty"`
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (s *WikiPageSettings) UnmarshalJSON(b []byte) error {
+	root := new(struct {
+		PermissionLevel WikiPagePermissionLevel `json:"permlevel"`
+		Listed          bool                    `json:"listed"`
+		Things          []thing                 `json:"editors"`
+	})
+
+	err := json.Unmarshal(b, root)
+	if err != nil {
+		return err
+	}
+
+	s.PermissionLevel = root.PermissionLevel
+	s.Listed = root.Listed
+
+	for _, thing := range root.Things {
+		if user, ok := thing.User(); ok {
+			s.Editors = append(s.Editors, user)
+		}
+	}
+
+	return nil
+}
+
+// Pages retrieves a list of wiki pages in the subreddit.
+// Returns 403 Forbidden if the wiki is disabled.
+func (s *WikiService) Pages(ctx context.Context, subreddit string) ([]string, *Response, error) {
+	path := fmt.Sprintf("r/%s/wiki/pages", subreddit)
+
+	req, err := s.client.NewRequest(http.MethodGet, path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(thing)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	pages, _ := root.WikiPages()
+	return pages, resp, nil
+}
+
+// Settings gets the subreddit's wiki page's settings.
+func (s *WikiService) Settings(ctx context.Context, subreddit, page string) (*WikiPageSettings, *Response, error) {
+	path := fmt.Sprintf("r/%s/wiki/settings/%s", subreddit, page)
+
+	req, err := s.client.NewRequest(http.MethodGet, path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(thing)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	settings, _ := root.WikiPageSettings()
+	return settings, resp, nil
+}
+
+// UpdateSettings updates the subreddit's wiki page's settings.
+func (s *WikiService) UpdateSettings(ctx context.Context, subreddit, page string, updateRequest *WikiPageSettingsUpdateRequest) (*WikiPageSettings, *Response, error) {
+	if updateRequest == nil {
+		return nil, nil, errors.New("updateRequest: cannot be nil")
+	}
+
+	form, err := query.Values(updateRequest)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	path := fmt.Sprintf("r/%s/wiki/settings/%s", subreddit, page)
+	req, err := s.client.NewRequestWithForm(http.MethodPost, path, form)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	root := new(thing)
+	resp, err := s.client.Do(ctx, req, root)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	settings, _ := root.WikiPageSettings()
+	return settings, resp, nil
+}
+
+// Allow the user to edit the specified wiki page in the subreddit.
+func (s *WikiService) Allow(ctx context.Context, subreddit, page, username string) (*Response, error) {
+	path := fmt.Sprintf("r/%s/api/wiki/alloweditor/add", subreddit)
+
+	form := url.Values{}
+	form.Set("page", page)
+	form.Set("username", username)
+
+	req, err := s.client.NewRequestWithForm(http.MethodPost, path, form)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(ctx, req, nil)
+}
+
+// Deny the user the ability to edit the specified wiki page in the subreddit.
+func (s *WikiService) Deny(ctx context.Context, subreddit, page, username string) (*Response, error) {
+	path := fmt.Sprintf("r/%s/api/wiki/alloweditor/del", subreddit)
+
+	form := url.Values{}
+	form.Set("page", page)
+	form.Set("username", username)
+
+	req, err := s.client.NewRequestWithForm(http.MethodPost, path, form)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(ctx, req, nil)
+}
diff --git a/reddit/wiki_test.go b/reddit/wiki_test.go
new file mode 100644
index 0000000..0edfb00
--- /dev/null
+++ b/reddit/wiki_test.go
@@ -0,0 +1,138 @@
+package reddit
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+var expectedWikiPageSettings = &WikiPageSettings{
+	PermissionLevel: PermissionSubredditWikiPermissions,
+	Listed:          true,
+	Editors: []*User{
+		{
+			ID:      "164ab8",
+			Name:    "v_95",
+			Created: &Timestamp{time.Date(2017, 3, 12, 4, 56, 47, 0, time.UTC)},
+
+			PostKarma:    691,
+			CommentKarma: 22235,
+
+			HasVerifiedEmail: true,
+			NSFW:             true,
+		},
+	},
+}
+
+func TestWikiService_Pages(t *testing.T) {
+	client, mux, teardown := setup()
+	defer teardown()
+
+	mux.HandleFunc("/r/testsubreddit/wiki/pages", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodGet, r.Method)
+		fmt.Fprint(w, `{
+			"kind": "wikipagelisting",
+			"data": [
+				"faq",
+				"index"
+			]
+		}`)
+	})
+
+	pages, _, err := client.Wiki.Pages(ctx, "testsubreddit")
+	require.NoError(t, err)
+	require.Equal(t, []string{"faq", "index"}, pages)
+}
+
+func TestWikiService_Settings(t *testing.T) {
+	client, mux, teardown := setup()
+	defer teardown()
+
+	blob, err := readFileContents("../testdata/wiki/page-settings.json")
+	require.NoError(t, err)
+
+	mux.HandleFunc("/r/testsubreddit/wiki/settings/testpage", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodGet, r.Method)
+		fmt.Fprint(w, blob)
+	})
+
+	settings, _, err := client.Wiki.Settings(ctx, "testsubreddit", "testpage")
+	require.NoError(t, err)
+	require.Equal(t, expectedWikiPageSettings, settings)
+}
+
+func TestWikiService_UpdateSettings(t *testing.T) {
+	client, mux, teardown := setup()
+	defer teardown()
+
+	blob, err := readFileContents("../testdata/wiki/page-settings.json")
+	require.NoError(t, err)
+
+	mux.HandleFunc("/r/testsubreddit/wiki/settings/testpage", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("permlevel", "1")
+		form.Set("listed", "false")
+
+		err := r.ParseForm()
+		require.NoError(t, err)
+		require.Equal(t, form, r.PostForm)
+
+		fmt.Fprint(w, blob)
+	})
+
+	_, _, err = client.Wiki.UpdateSettings(ctx, "testsubreddit", "testpage", nil)
+	require.EqualError(t, err, "updateRequest: cannot be nil")
+
+	settings, _, err := client.Wiki.UpdateSettings(ctx, "testsubreddit", "testpage", &WikiPageSettingsUpdateRequest{
+		Listed:          Bool(false),
+		PermissionLevel: PermissionApprovedContributorsOnly,
+	})
+	require.NoError(t, err)
+	require.Equal(t, expectedWikiPageSettings, settings)
+}
+
+func TestWikiService_Allow(t *testing.T) {
+	client, mux, teardown := setup()
+	defer teardown()
+
+	mux.HandleFunc("/r/testsubreddit/api/wiki/alloweditor/add", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("page", "testpage")
+		form.Set("username", "testusername")
+
+		err := r.ParseForm()
+		require.NoError(t, err)
+		require.Equal(t, form, r.PostForm)
+	})
+
+	_, err := client.Wiki.Allow(ctx, "testsubreddit", "testpage", "testusername")
+	require.NoError(t, err)
+}
+
+func TestWikiService_Deny(t *testing.T) {
+	client, mux, teardown := setup()
+	defer teardown()
+
+	mux.HandleFunc("/r/testsubreddit/api/wiki/alloweditor/del", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("page", "testpage")
+		form.Set("username", "testusername")
+
+		err := r.ParseForm()
+		require.NoError(t, err)
+		require.Equal(t, form, r.PostForm)
+	})
+
+	_, err := client.Wiki.Deny(ctx, "testsubreddit", "testpage", "testusername")
+	require.NoError(t, err)
+}
diff --git a/testdata/wiki/page-settings.json b/testdata/wiki/page-settings.json
new file mode 100644
index 0000000..ef94444
--- /dev/null
+++ b/testdata/wiki/page-settings.json
@@ -0,0 +1,180 @@
+{
+  "kind": "wikipagesettings",
+  "data": {
+    "permlevel": 0,
+    "editors": [
+      {
+        "kind": "t2",
+        "data": {
+          "is_employee": false,
+          "has_visited_new_profile": false,
+          "is_friend": false,
+          "pref_no_profanity": false,
+          "has_external_account": false,
+          "pref_geopopular": "GLOBAL",
+          "pref_show_trending": true,
+          "subreddit": {
+            "default_set": true,
+            "user_is_contributor": false,
+            "banner_img": "",
+            "restrict_posting": true,
+            "user_is_banned": false,
+            "free_form_reports": true,
+            "community_icon": null,
+            "show_media": true,
+            "icon_color": "#94E044",
+            "user_is_muted": false,
+            "display_name": "u_v_95",
+            "header_img": null,
+            "title": "",
+            "coins": 0,
+            "previous_names": [],
+            "over_18": false,
+            "icon_size": [256, 256],
+            "primary_color": "",
+            "icon_img": "https://www.redditstatic.com/avatars/avatar_default_01_94E044.png",
+            "description": "",
+            "submit_link_label": "",
+            "header_size": null,
+            "restrict_commenting": false,
+            "subscribers": 1,
+            "submit_text_label": "",
+            "is_default_icon": true,
+            "link_flair_position": "",
+            "display_name_prefixed": "u/v_95",
+            "key_color": "",
+            "name": "t5_17a8op",
+            "is_default_banner": true,
+            "url": "/user/v_95/",
+            "quarantine": false,
+            "banner_size": null,
+            "user_is_moderator": true,
+            "public_description": "",
+            "link_flair_enabled": false,
+            "disable_contributor_requests": false,
+            "subreddit_type": "user",
+            "user_is_subscriber": false
+          },
+          "is_sponsor": false,
+          "gold_expiration": null,
+          "has_gold_subscription": false,
+          "num_friends": 29,
+          "features": {
+            "mod_service_mute_writes": true,
+            "promoted_trend_blanks": true,
+            "show_amp_link": true,
+            "report_service_handles_report_writes_to_db_for_helpdesk_reports": true,
+            "report_service_handles_self_harm_reports": true,
+            "report_service_handles_report_writes_to_db_for_modmail_reports": true,
+            "chat": true,
+            "mweb_link_tab": {
+              "owner": "growth",
+              "variant": "treatment_1",
+              "experiment_id": 404
+            },
+            "reports_double_write_to_report_service_for_spam": true,
+            "is_email_permission_required": true,
+            "reports_double_write_to_report_service_for_modmail_reports": true,
+            "mod_awards": true,
+            "econ_wallet_service": true,
+            "mweb_xpromo_revamp_v2": {
+              "owner": "growth",
+              "variant": "treatment_6",
+              "experiment_id": 457
+            },
+            "awards_on_streams": true,
+            "report_service_handles_accept_report": true,
+            "mweb_xpromo_modal_listing_click_daily_dismissible_ios": true,
+            "reports_double_write_to_report_service_for_som": true,
+            "chat_subreddit": true,
+            "reports_double_write_to_report_service_for_users": true,
+            "modlog_copyright_removal": true,
+            "report_service_handles_report_writes_to_db_for_users": true,
+            "do_not_track": true,
+            "reports_double_write_to_report_service_for_helpdesk_reports": true,
+            "report_service_handles_report_writes_to_db_for_spam": true,
+            "reports_double_write_to_report_service_for_sendbird_chats": true,
+            "mod_service_mute_reads": true,
+            "mweb_xpromo_interstitial_comments_ios": true,
+            "mweb_xpromo_modal_listing_click_daily_dismissible_android": true,
+            "chat_user_settings": true,
+            "premium_subscriptions_table": true,
+            "reports_double_write_to_report_service": true,
+            "mweb_xpromo_interstitial_comments_android": true,
+            "report_service_handles_report_writes_to_db_for_awards": true,
+            "mweb_nsfw_xpromo": {
+              "owner": "growth",
+              "variant": "control_2",
+              "experiment_id": 361
+            },
+            "noreferrer_to_noopener": true,
+            "reports_double_write_to_report_service_for_awards": true,
+            "mweb_sharing_web_share_api": {
+              "owner": "growth",
+              "variant": "control_1",
+              "experiment_id": 314
+            },
+            "mweb_xpromo_revamp_v3": {
+              "owner": "growth",
+              "variant": "treatment_2",
+              "experiment_id": 480
+            },
+            "chat_group_rollout": true,
+            "resized_styles_images": true,
+            "spez_modal": true,
+            "mweb_sharing_clipboard": {
+              "owner": "growth",
+              "variant": "control_2",
+              "experiment_id": 315
+            },
+            "expensive_coins_package": true,
+            "report_service_handles_report_writes_to_db_for_som": true
+          },
+          "can_edit_name": false,
+          "verified": true,
+          "new_modmail_exists": true,
+          "pref_autoplay": true,
+          "coins": 0,
+          "has_paypal_subscription": false,
+          "has_subscribed_to_premium": false,
+          "id": "164ab8",
+          "has_stripe_subscription": false,
+          "can_create_subreddit": true,
+          "over_18": true,
+          "is_gold": false,
+          "is_mod": true,
+          "suspension_expiration_utc": null,
+          "has_verified_email": true,
+          "is_suspended": false,
+          "pref_video_autoplay": true,
+          "in_chat": true,
+          "has_android_subscription": false,
+          "in_redesign_beta": false,
+          "icon_img": "https://www.redditstatic.com/avatars/avatar_default_01_94E044.png",
+          "has_mod_mail": false,
+          "pref_nightmode": true,
+          "hide_from_robots": false,
+          "password_set": true,
+          "modhash": null,
+          "link_karma": 691,
+          "force_password_reset": false,
+          "inbox_count": 0,
+          "pref_top_karma_subreddits": false,
+          "has_mail": false,
+          "pref_show_snoovatar": false,
+          "name": "v_95",
+          "pref_clickgadget": 5,
+          "created": 1489323407.0,
+          "gold_creddits": 0,
+          "created_utc": 1489294607.0,
+          "has_ios_subscription": false,
+          "pref_show_twitter": false,
+          "in_beta": false,
+          "comment_karma": 22235,
+          "has_subscribed": true
+        }
+      }
+    ],
+    "listed": true
+  }
+}