diff --git a/src/client/websocket/handlers/APPLICATION_COMMAND_CREATE.js b/src/client/websocket/handlers/APPLICATION_COMMAND_CREATE.js
new file mode 100644
index 000000000000..9d7125a89ce1
--- /dev/null
+++ b/src/client/websocket/handlers/APPLICATION_COMMAND_CREATE.js
@@ -0,0 +1,22 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let command;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    command = guild.commands.add(data);
+  } else {
+    command = client.application.commands.add(data);
+  }
+
+  /**
+   * Emitted when an application command is created.
+   * @event Client#applicationCommandCreate
+   * @param {ApplicationCommand} command The command which was created
+   */
+  client.emit(Events.APPLICATION_COMMAND_CREATE, command);
+};
diff --git a/src/client/websocket/handlers/APPLICATION_COMMAND_DELETE.js b/src/client/websocket/handlers/APPLICATION_COMMAND_DELETE.js
new file mode 100644
index 000000000000..c0eb3008a9a8
--- /dev/null
+++ b/src/client/websocket/handlers/APPLICATION_COMMAND_DELETE.js
@@ -0,0 +1,24 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let command;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    command = guild.commands.add(data);
+    guild.commands.cache.delete(data.id);
+  } else {
+    command = client.application.commands.add(data);
+    client.application.commands.cache.delete(data.id);
+  }
+
+  /**
+   * Emitted when an application command is deleted.
+   * @event Client#applicationCommandDelete
+   * @param {ApplicationCommand} command The command which was deleted
+   */
+  client.emit(Events.APPLICATION_COMMAND_DELETE, command);
+};
diff --git a/src/client/websocket/handlers/APPLICATION_COMMAND_UPDATE.js b/src/client/websocket/handlers/APPLICATION_COMMAND_UPDATE.js
new file mode 100644
index 000000000000..d2708eecfe76
--- /dev/null
+++ b/src/client/websocket/handlers/APPLICATION_COMMAND_UPDATE.js
@@ -0,0 +1,26 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let oldCommand;
+  let newCommand;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    oldCommand = guild.commands.cache.get(data.id)?._clone() ?? null;
+    newCommand = guild.commands.add(data);
+  } else {
+    oldCommand = client.application.commands.cache.get(data.id)?._clone() ?? null;
+    newCommand = client.application.commands.add(data);
+  }
+
+  /**
+   * Emitted when an application command is updated.
+   * @event Client#applicationCommandUpdate
+   * @param {?ApplicationCommand} oldCommand The command before the update
+   * @param {ApplicationCommand} newCommand The command after the update
+   */
+  client.emit(Events.APPLICATION_COMMAND_UPDATE, oldCommand, newCommand);
+};
diff --git a/src/util/Constants.js b/src/util/Constants.js
index bf6e00f7c95e..ca905ddc1dab 100644
--- a/src/util/Constants.js
+++ b/src/util/Constants.js
@@ -228,6 +228,9 @@ exports.Events = {
   RATE_LIMIT: 'rateLimit',
   INVALID_REQUEST_WARNING: 'invalidRequestWarning',
   CLIENT_READY: 'ready',
+  APPLICATION_COMMAND_CREATE: 'applicationCommandCreate',
+  APPLICATION_COMMAND_DELETE: 'applicationCommandDelete',
+  APPLICATION_COMMAND_UPDATE: 'applicationCommandUpdate',
   GUILD_CREATE: 'guildCreate',
   GUILD_DELETE: 'guildDelete',
   GUILD_UPDATE: 'guildUpdate',
@@ -310,6 +313,9 @@ exports.PartialTypes = keyMirror(['USER', 'CHANNEL', 'GUILD_MEMBER', 'MESSAGE',
  * The type of a websocket message event, e.g. `MESSAGE_CREATE`. Here are the available events:
  * * READY
  * * RESUMED
+ * * APPLICATION_COMMAND_CREATE
+ * * APPLICATION_COMMAND_DELETE
+ * * APPLICATION_COMMAND_UPDATE
  * * GUILD_CREATE
  * * GUILD_DELETE
  * * GUILD_UPDATE
@@ -350,6 +356,9 @@ exports.PartialTypes = keyMirror(['USER', 'CHANNEL', 'GUILD_MEMBER', 'MESSAGE',
 exports.WSEvents = keyMirror([
   'READY',
   'RESUMED',
+  'APPLICATION_COMMAND_CREATE',
+  'APPLICATION_COMMAND_DELETE',
+  'APPLICATION_COMMAND_UPDATE',
   'GUILD_CREATE',
   'GUILD_DELETE',
   'GUILD_UPDATE',
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 9df7bc58f126..77fbcddff482 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -478,6 +478,9 @@ declare module 'discord.js' {
       INVALID_REQUEST_WARNING: 'invalidRequestWarning';
       CLIENT_READY: 'ready';
       RESUMED: 'resumed';
+      APPLICATION_COMMAND_CREATE: 'applicationCommandCreate';
+      APPLICATION_COMMAND_DELETE: 'applicationCommandDelete';
+      APPLICATION_COMMAND_UPDATE: 'applicationCommandUpdate';
       GUILD_CREATE: 'guildCreate';
       GUILD_DELETE: 'guildDelete';
       GUILD_UPDATE: 'guildUpdate';
@@ -2543,6 +2546,9 @@ declare module 'discord.js' {
   type ChannelResolvable = Channel | Snowflake;
 
   interface ClientEvents {
+    applicationCommandCreate: [command: ApplicationCommand];
+    applicationCommandDelete: [command: ApplicationCommand];
+    applicationCommandUpdate: [oldCommand: ApplicationCommand | null, newCommand: ApplicationCommand];
     channelCreate: [channel: GuildChannel];
     channelDelete: [channel: DMChannel | GuildChannel];
     channelPinsUpdate: [channel: Channel | PartialDMChannel, date: Date];
@@ -3589,6 +3595,9 @@ declare module 'discord.js' {
   type WSEventType =
     | 'READY'
     | 'RESUMED'
+    | 'APPLICATION_COMMAND_CREATE'
+    | 'APPLICATION_COMMAND_DELETE'
+    | 'APPLICATION_COMMAND_UPDATE'
     | 'GUILD_CREATE'
     | 'GUILD_DELETE'
     | 'GUILD_UPDATE'