diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4d6912..d79fb14 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Support calling `/api/v1/accounts/search` with `resolve` parameter.
 - Created `/api/v1/accounts/aliases/all` API endpoint.
+- Created API endpoint for adding aliases.
 
 ### Changed
 
diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index 79ecb4e..a9c432b 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -803,6 +803,28 @@ paths:
                 $ref: '#/components/schemas/CredentialAccount'
         400:
           description: Invalid request data.
+  /api/v1/settings/aliases:
+    post:
+      summary: Add alias (not verified).
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                acct:
+                  description: Actor address.
+                  type: string
+                  example: user@example.com
+      responses:
+        200:
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Aliases'
+        404:
+          description: Profile not found.
   /api/v1/settings/export_followers:
     get:
       summary: Export followers to CSV file
diff --git a/src/mastodon_api/settings/types.rs b/src/mastodon_api/settings/types.rs
index 37db750..55b91c2 100644
--- a/src/mastodon_api/settings/types.rs
+++ b/src/mastodon_api/settings/types.rs
@@ -10,6 +10,11 @@ pub struct ImportFollowsRequest {
     pub follows_csv: String,
 }
 
+#[derive(Deserialize)]
+pub struct AddAliasRequest {
+    pub acct: String,
+}
+
 #[derive(Deserialize)]
 pub struct MoveFollowersRequest {
     pub from_actor_id: String,
diff --git a/src/mastodon_api/settings/views.rs b/src/mastodon_api/settings/views.rs
index 01ca5e1..577b10a 100644
--- a/src/mastodon_api/settings/views.rs
+++ b/src/mastodon_api/settings/views.rs
@@ -12,7 +12,12 @@ use mitra_config::Config;
 use mitra_models::{
     database::{get_database_client, DatabaseError, DbPool},
     profiles::helpers::find_verified_aliases,
-    profiles::queries::get_profile_by_remote_actor_id,
+    profiles::queries::{
+        get_profile_by_acct,
+        get_profile_by_remote_actor_id,
+        update_profile,
+    },
+    profiles::types::ProfileUpdateData,
     users::queries::set_user_password,
 };
 use mitra_utils::passwords::hash_password;
@@ -21,6 +26,7 @@ use crate::activitypub::identifiers::profile_actor_id;
 use crate::errors::ValidationError;
 use crate::http::get_request_base_url;
 use crate::mastodon_api::{
+    accounts::helpers::get_aliases,
     accounts::types::Account,
     errors::MastodonError,
     oauth::auth::get_current_user,
@@ -33,6 +39,7 @@ use super::helpers::{
     parse_address_list,
 };
 use super::types::{
+    AddAliasRequest,
     ImportFollowsRequest,
     MoveFollowersRequest,
     PasswordChangeRequest,
@@ -59,6 +66,37 @@ async fn change_password_view(
     Ok(HttpResponse::Ok().json(account))
 }
 
+#[post("/aliases")]
+async fn add_alias_view(
+    auth: BearerAuth,
+    config: web::Data<Config>,
+    connection_info: ConnectionInfo,
+    db_pool: web::Data<DbPool>,
+    request_data: web::Json<AddAliasRequest>,
+) -> Result<HttpResponse, MastodonError> {
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    let mut current_user = get_current_user(db_client, auth.token()).await?;
+    let alias = get_profile_by_acct(db_client, &request_data.acct).await?;
+    let instance = config.instance();
+    let alias_id = profile_actor_id(&instance.url(), &alias);
+    let mut profile_data = ProfileUpdateData::from(&current_user.profile);
+    if !profile_data.aliases.contains(&alias_id) {
+        profile_data.aliases.push(alias_id);
+    };
+    current_user.profile = update_profile(
+        db_client,
+        &current_user.id,
+        profile_data,
+    ).await?;
+    let aliases = get_aliases(
+        db_client,
+        &get_request_base_url(connection_info),
+        &instance.url(),
+        &current_user.profile,
+    ).await?;
+    Ok(HttpResponse::Ok().json(aliases))
+}
+
 #[get("/export_followers")]
 async fn export_followers_view(
     auth: BearerAuth,
@@ -185,6 +223,7 @@ async fn move_followers(
 pub fn settings_api_scope() -> Scope {
     web::scope("/api/v1/settings")
         .service(change_password_view)
+        .service(add_alias_view)
         .service(export_followers_view)
         .service(export_follows_view)
         .service(import_follows_view)