diff --git a/docs/configuration.md b/docs/configuration.md
index 9687ead1..4318e5ee 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -45,6 +45,8 @@ The `global` section contains the following fields:
 | `allow_federation` | `boolean` | Allow federation with other servers | `true` |
 | `allow_room_creation` | `boolean` | Allow users to create rooms | `true` |
 | `allow_unstable_room_versions` | `boolean` | Allow users to create and join rooms with unstable versions | `true` |
+| `default_rooms` | `array` | The list of rooms that will be joined by default on registration | [] |
+| `default_rooms_join_reason` | `string` | The reason for joining the rooms | "Hello from Conduit!" |
 | `default_room_version` | `string` | The default room version (`"6"`-`"10"`)| `"10"` |
 | `allow_jaeger` | `boolean` | Allow Jaeger tracing | `false` |
 | `tracing_flame` | `boolean` | Enable flame tracing | `false` |
@@ -111,3 +113,14 @@ exclude = ["*.clearnet.onion"]
 [global]
 {{#include ../conduit-example.toml:22:}}
 ```
+
+
+### Default rooms
+This list should contain either room identifiers or aliases.
+Opaque identifiers will be interpreted as incomplete, local aliases.
+
+#### Example
+In this example, the opaque identifier and alias are the same:
+```toml
+default_rooms = ["home", "#home:conduit.rs"]
+```
diff --git a/src/api/client_server/account.rs b/src/api/client_server/account.rs
index 47ccdc83..152b82bd 100644
--- a/src/api/client_server/account.rs
+++ b/src/api/client_server/account.rs
@@ -1,5 +1,8 @@
 use super::{DEVICE_ID_LENGTH, SESSION_ID_LENGTH, TOKEN_LENGTH};
-use crate::{api::client_server, services, utils, Error, Result, Ruma};
+use crate::{
+    api::client_server::{self, membership::join_room_by_id_helper},
+    services, utils, Error, Result, Ruma,
+};
 use ruma::{
     api::client::{
         account::{
@@ -287,6 +290,26 @@ pub async fn register_route(body: Ruma<register::v3::Request>) -> Result<registe
                 warn!("Granting {} admin privileges as the first user", user_id);
             }
         }
+
+        let default_rooms = services().globals.default_rooms().await?;
+        let servers: Vec<_> = default_rooms
+            .iter()
+            .filter_map(|r| r.server_name().map(ToOwned::to_owned))
+            .collect();
+
+        for room_id in &default_rooms {
+            if let Err(e) = join_room_by_id_helper(
+                Some(&user_id),
+                room_id,
+                services().globals.config.default_rooms.join_reason.clone(),
+                &servers,
+                None,
+            )
+            .await
+            {
+                warn!("Failed to join default room: {}", e);
+            }
+        }
     }
 
     Ok(register::v3::Response {
diff --git a/src/api/client_server/membership.rs b/src/api/client_server/membership.rs
index baf2f239..b5a83d1c 100644
--- a/src/api/client_server/membership.rs
+++ b/src/api/client_server/membership.rs
@@ -518,7 +518,7 @@ pub async fn joined_members_route(
     Ok(joined_members::v3::Response { joined })
 }
 
-async fn join_room_by_id_helper(
+pub async fn join_room_by_id_helper(
     sender_user: Option<&UserId>,
     room_id: &RoomId,
     reason: Option<String>,
diff --git a/src/config/mod.rs b/src/config/mod.rs
index 378ab929..5f5355a1 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -61,6 +61,8 @@ pub struct Config {
     pub default_room_version: RoomVersionId,
     #[serde(default)]
     pub well_known: WellKnownConfig,
+    #[serde(default)]
+    pub default_rooms: DefaultRoomsConfig,
     #[serde(default = "false_fn")]
     pub allow_jaeger: bool,
     #[serde(default = "false_fn")]
@@ -101,6 +103,13 @@ pub struct WellKnownConfig {
     pub server: Option<OwnedServerName>,
 }
 
+#[derive(Clone, Debug, Deserialize, Default)]
+pub struct DefaultRoomsConfig {
+    #[serde(default = "Vec::new")]
+    pub rooms: Vec<String>,
+    pub join_reason: Option<String>,
+}
+
 const DEPRECATED_KEYS: &[&str] = &["cache_capacity"];
 
 impl Config {
diff --git a/src/service/globals/mod.rs b/src/service/globals/mod.rs
index 3325e518..d7306569 100644
--- a/src/service/globals/mod.rs
+++ b/src/service/globals/mod.rs
@@ -1,11 +1,12 @@
 mod data;
 pub use data::{Data, SigningKeys};
+
 use ruma::{
     serde::Base64, MilliSecondsSinceUnixEpoch, OwnedDeviceId, OwnedEventId, OwnedRoomAliasId,
-    OwnedRoomId, OwnedServerName, OwnedUserId, RoomAliasId,
+    OwnedRoomId, OwnedRoomOrAliasId, OwnedServerName, OwnedUserId, RoomAliasId,
 };
 
-use crate::api::server_server::DestinationResponse;
+use crate::api::{client_server::get_alias_helper, server_server::DestinationResponse};
 
 use crate::{services, Config, Error, Result};
 use futures_util::FutureExt;
@@ -17,7 +18,7 @@ use ruma::{
     DeviceId, RoomVersionId, ServerName, UserId,
 };
 use std::{
-    collections::{BTreeMap, HashMap},
+    collections::{BTreeMap, BTreeSet, HashMap},
     error::Error as StdError,
     fs,
     future::{self, Future},
@@ -33,7 +34,7 @@ use std::{
 };
 use tokio::sync::{broadcast, watch::Receiver, Mutex, RwLock, Semaphore};
 use tower_service::Service as TowerService;
-use tracing::{error, info};
+use tracing::{error, info, warn};
 
 use base64::{engine::general_purpose, Engine as _};
 
@@ -505,6 +506,33 @@ impl Service {
         self.config.well_known_client()
     }
 
+    pub async fn default_rooms(&self) -> Result<BTreeSet<OwnedRoomId>> {
+        let server_name = &self.config.server_name;
+
+        let f = |s| async move {
+            match OwnedRoomOrAliasId::from_str(s).map(OwnedRoomId::try_from) {
+                Ok(Ok(room_id)) => room_id
+                    .server_name()
+                    .ok_or_else(|| Error::bad_config("Invalid room ID due to missing server name."))
+                    .map(|_| room_id.clone()),
+                result => get_alias_helper(result.map(Result::unwrap_err).or_else(|_| {
+                    format!("#{s}:{server_name}")
+                        .parse()
+                        .map_err(|_| Error::bad_config("Invalid opaque identifier."))
+                })?)
+                .await
+                .map(|response| response.room_id),
+            }
+        };
+
+        let rooms = self.config.default_rooms.rooms.iter().map(String::as_str);
+
+        futures_util::future::try_join_all(rooms.map(f))
+            .await
+            .map(Vec::into_iter)
+            .map(BTreeSet::from_iter)
+    }
+
     pub fn shutdown(&self) {
         self.shutdown.store(true, atomic::Ordering::Relaxed);
         // On shutdown