diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6191fa4..e7b983d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Introduce new administrative channel management endpoints `/admin/v1/realms/{realmId}/channels`.
 - Introduce new administrative subscription management endpoints `/admin/v1/realms/{realmId}/subscriptions`.
 - Introduce new administrative endpoint for deleting auth tokens `DELETE /admin/v1/realms/{realmId}/tokens/{tokenId}`
+- Introduce limit settings on realm level ([#151]).
 
 ### Changed
 - Add support for upgraded verneMQ broker. This requires the acceptance of their [EULA](https://vernemq.com/end-user-license-agreement/),
@@ -20,6 +21,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Hide secret `auth.token` from all responses, except token creation, to avoid access right escalation. ([#138])
 
 [#138]: https://github.com/realmq/realmq-platform/issues/138
+[#151]: https://github.com/realmq/realmq-platform/issues/151
 
 ## [0.2.0] - 2023-03-09
 
diff --git a/src/api/admin/v1/mappers/index.js b/src/api/admin/v1/mappers/index.js
index 05efe5d..ece75c9 100644
--- a/src/api/admin/v1/mappers/index.js
+++ b/src/api/admin/v1/mappers/index.js
@@ -3,6 +3,7 @@ const authList = require('./auth-list');
 const channel = require('./channel');
 const channelList = require('./channel-list');
 const realm = require('./realm');
+const realmDetails = require('./realm-details');
 const realmList = require('./realm-list');
 const subscription = require('./subscription');
 const subscriptionList = require('./subscription-list');
@@ -18,6 +19,7 @@ module.exports = {
   channel,
   channelList,
   realm,
+  realmDetails,
   realmList,
   subscription,
   subscriptionList,
diff --git a/src/api/admin/v1/mappers/realm-details.js b/src/api/admin/v1/mappers/realm-details.js
new file mode 100644
index 0000000..d400f52
--- /dev/null
+++ b/src/api/admin/v1/mappers/realm-details.js
@@ -0,0 +1,30 @@
+const mapRealm = require('./realm');
+const mapGenericEntity = require('../../../../lib/mappers/generic-entity');
+
+/**
+ * @class RealmViewModel
+ * @property {string} id
+ * @property {string} name
+ * @property {Date} createdAt
+ * @property {Date} updatedAt
+ */
+/**
+ * Map a realm to detail response view model
+ * @param {object} args
+ * @param {RealmModel} args.realm The realm entity
+ * @param {RealmLimitsModel} args.realmLimits The realm limits entity
+ * @return {RealmViewModel} The realm view model
+ */
+module.exports = ({realm, realmLimits}) => ({
+  ...mapRealm(realm),
+  limits: mapGenericEntity({
+    entity: realmLimits,
+    propertyMap: {
+      maxConnections: 'maxConnections',
+      sessionMaxMessageRate: 'sessionMaxMessageRate',
+      sessionMaxConnectionLifetime: 'sessionMaxConnectionLifetime',
+      sessionMaxMessageSize: 'sessionMaxMessageSize',
+    }
+  }),
+});
+
diff --git a/src/api/admin/v1/mappers/realm.js b/src/api/admin/v1/mappers/realm.js
index f165a8d..49073dc 100644
--- a/src/api/admin/v1/mappers/realm.js
+++ b/src/api/admin/v1/mappers/realm.js
@@ -8,7 +8,7 @@ const mapGenericEntity = require('../../../../lib/mappers/generic-entity');
  * @property {Date} updatedAt
  */
 /**
- * Map an realm to response view model
+ * Map a realm to response view model
  * @param {RealmModel} realm The realm entity
  * @return {RealmViewModel} The realm view model
  */
diff --git a/src/api/admin/v1/openapi/definitions.yaml b/src/api/admin/v1/openapi/definitions.yaml
index 250e292..7a86d40 100644
--- a/src/api/admin/v1/openapi/definitions.yaml
+++ b/src/api/admin/v1/openapi/definitions.yaml
@@ -74,13 +74,39 @@ TimestampsTrait:
 Realm:
   allOf:
     - $ref: '#/definitions/BaseEntity'
-    - properties:
+    - type: object
+      properties:
         name:
           type: string
       required:
         - name
     - $ref: '#/definitions/TimestampsTrait'
 
+RealmDetails:
+  allOf:
+    - $ref: '#/definitions/Realm'
+    - type: object
+      properties:
+        limits:
+          $ref: '#/definitions/RealmLimits'
+
+RealmLimits:
+  type: object
+  properties:
+    maxConnections:
+      description: Maximum number of simultaneously online connections
+      type: integer
+    sessionMaxMessageRate:
+      description: Maximum incoming publish rate per session per second
+      type: integer
+    sessionMaxConnectionLifetime:
+      description: Maximum lifetime of a connection in seconds
+      type: integer
+    sessionMaxMessageSize:
+      description: Maximum size of a message payload in bytes
+      type: integer
+  additionalProperties: false
+
 RealmList:
   allOf:
     - $ref: '#/definitions/BaseList'
diff --git a/src/api/admin/v1/routes/realms.js b/src/api/admin/v1/routes/realms.js
index 773e880..b879954 100644
--- a/src/api/admin/v1/routes/realms.js
+++ b/src/api/admin/v1/routes/realms.js
@@ -16,13 +16,16 @@ module.exports = (tasks, mappers) => ({
   },
 
   async post(request, response) {
-    const {body: {name}} = request;
-    const {ok, result: realm, error} = await tasks.admin.createRealm({name});
+    const {body: {name, limits = {}}} = request;
+    const {ok, result, error} = await tasks.admin.createRealm({name, limits});
 
     if (!ok) {
       throw error;
     }
 
-    return response.status(201).json(mappers.realm(realm));
+    return response.status(201).json(mappers.realm({
+      realm: result.realm,
+      realmLimits: result.realmLimits
+    }));
   },
 });
diff --git a/src/api/admin/v1/routes/realms.yaml b/src/api/admin/v1/routes/realms.yaml
index 1f9c0fc..fa75570 100644
--- a/src/api/admin/v1/routes/realms.yaml
+++ b/src/api/admin/v1/routes/realms.yaml
@@ -40,11 +40,13 @@
             name:
               description: The name of the real, eg. project/org name
               type: string
+            limits:
+              $ref: '#/definitions/RealmLimits'
     responses:
       201:
         description: Realm was successfully created.
         schema:
-          $ref: '#/definitions/Realm'
+          $ref: '#/definitions/RealmDetails'
       400:
         description: Request validation failed.
       401:
diff --git a/src/bootstrap/repositories.js b/src/bootstrap/repositories.js
index 8c9c71c..3d75688 100644
--- a/src/bootstrap/repositories.js
+++ b/src/bootstrap/repositories.js
@@ -12,6 +12,7 @@ module.exports = async ({db}) => {
     channelCollection,
     messageCollection,
     realmCollection,
+    realmLimitsCollection,
     realtimeConnectionCollection,
     subscriptionCollection,
     userCollection,
@@ -20,6 +21,7 @@ module.exports = async ({db}) => {
     db.collection('channels'),
     db.collection('messages'),
     db.collection('realms'),
+    db.collection('realm-limits'),
     db.collection('realtime-connections'),
     db.collection('subscriptions'),
     db.collection('users'),
@@ -29,6 +31,7 @@ module.exports = async ({db}) => {
     channelCollection,
     messageCollection,
     realmCollection,
+    realmLimitsCollection,
     realtimeConnectionCollection,
     subscriptionCollection,
     userCollection,
diff --git a/src/bootstrap/tasks.js b/src/bootstrap/tasks.js
index f386c2b..502dceb 100644
--- a/src/bootstrap/tasks.js
+++ b/src/bootstrap/tasks.js
@@ -26,6 +26,7 @@ module.exports = ({
     channel: channelRepository,
     message: messageRepository,
     realm: realmRepository,
+    realmLimits: realmLimitsRepository,
     realtimeConnection: realtimeConnectionRepository,
     subscription: subscriptionRepository,
     user: userRepository,
@@ -44,6 +45,7 @@ module.exports = ({
       authRepository,
       channelRepository,
       realmRepository,
+      realmLimitsRepository,
       subscriptionRepository,
       userRepository,
       sendSubscriptionSyncMessage,
@@ -54,6 +56,7 @@ module.exports = ({
       authRepository,
       channelRepository,
       subscriptionRepository,
+      realmLimitsRepository,
       realtimeConnectionRepository,
       messageRepository,
       userRepository,
diff --git a/src/index.js b/src/index.js
index 2c775a6..8623889 100644
--- a/src/index.js
+++ b/src/index.js
@@ -34,3 +34,4 @@ const createLogger = require('./lib/logger');
     process.exit(1);
   }
 })();
+
diff --git a/src/models/realm-limits.js b/src/models/realm-limits.js
new file mode 100644
index 0000000..f8ce8f9
--- /dev/null
+++ b/src/models/realm-limits.js
@@ -0,0 +1,36 @@
+const stripUndefined = require('../lib/strip-undefined');
+
+/**
+ * @typedef {Object} RealmLimitsModel Specialized set of realm settings focused on connections/sessions
+ * @param {string} [id]
+ * @param {string} realmId
+ * @param {number} maxConnections Max number of simultaneously online connections
+ * @param {number} sessionMaxMessageRate Max incoming publish rate per session per second
+ * @param {number} sessionMaxConnectionLifetime Max lifetime of a connection in seconds
+ * @param {number} sessionMaxMessageSize Max message payload size in bytes
+ * @param {Date} [createdAt]
+ * @param {Date} [updatedAt]
+ */
+
+/**
+ * @return {RealmLimitsModel} The generalized realm model
+ */
+module.exports = ({
+  id,
+  realmId,
+  maxConnections,
+  sessionMaxMessageRate,
+  sessionMaxConnectionLifetime,
+  sessionMaxMessageSize,
+  createdAt,
+  updatedAt,
+}) => stripUndefined({
+  id,
+  realmId,
+  maxConnections,
+  sessionMaxMessageRate,
+  sessionMaxConnectionLifetime,
+  sessionMaxMessageSize,
+  createdAt,
+  updatedAt,
+});
diff --git a/src/repositories/index.js b/src/repositories/index.js
index 2d9b6dd..b18d415 100644
--- a/src/repositories/index.js
+++ b/src/repositories/index.js
@@ -2,6 +2,7 @@ const createAuthRepository = require('./auth');
 const createChannelRepository = require('./channel');
 const createMessageRepository = require('./message');
 const createRealmRepository = require('./realm');
+const createRealmLimitsRepository = require('./realm-limits');
 const createRealtimeConnectionRepository = require('./realtime-connection');
 const createSubscriptionRepository = require('./subscription');
 const createUserRepository = require('./user');
@@ -13,14 +14,20 @@ const createUserRepository = require('./user');
  * @param {Collection} channelCollection Dependency
  * @param {Collection} messageCollection Dependency
  * @param {Collection} realmCollection Dependency
+ * @param {Collection} realmLimitsCollection Dependency
  * @param {Collection} realtimeConnectionCollection Dependency
  * @param {Collection} subscriptionCollection Dependency
  * @param {Collection} userCollection Dependency
  * @return {Repositories} The repositories
  */
 module.exports = ({
-  authCollection, channelCollection, messageCollection,
-  realmCollection, subscriptionCollection, userCollection,
+  authCollection,
+  channelCollection,
+  messageCollection,
+  realmCollection,
+  realmLimitsCollection,
+  subscriptionCollection,
+  userCollection,
   realtimeConnectionCollection,
 }) =>
   /**
@@ -29,6 +36,7 @@ module.exports = ({
    * @property {ChannelRepository} channel
    * @property {MessageRepository} message
    * @property {RealmRepository} realm
+   * @property {RealmLimitsRepository} realmLimits
    * @property {RealtimeConnectionRepository} realtimeConnection
    * @property {SubscriptionRepository} subscription
    * @property {UserRepository} user
@@ -38,6 +46,7 @@ module.exports = ({
     channel: createChannelRepository({collection: channelCollection}),
     message: createMessageRepository({collection: messageCollection}),
     realm: createRealmRepository({collection: realmCollection}),
+    realmLimits: createRealmLimitsRepository({collection: realmLimitsCollection}),
     realtimeConnection: createRealtimeConnectionRepository({collection: realtimeConnectionCollection}),
     subscription: createSubscriptionRepository({collection: subscriptionCollection}),
     user: createUserRepository({collection: userCollection}),
diff --git a/src/repositories/realm-limits.js b/src/repositories/realm-limits.js
new file mode 100644
index 0000000..37c6430
--- /dev/null
+++ b/src/repositories/realm-limits.js
@@ -0,0 +1,22 @@
+const createRealmLimitsModel = require('../models/realm-limits');
+const createMongoRepository = require('./lib/mongo');
+
+/**
+ * Create realm repository.
+ *
+ * @param {Collection} collection Mongodb collection
+ * @param {function} createModel Model factory
+ * @return {RealmLimitsRepository} The created realm repository
+ */
+module.exports = ({collection, createModel = createRealmLimitsModel}) => {
+  const mongoRepo = createMongoRepository({collection, createModel});
+
+  /**
+   * @class RealmLimitsRepository
+   * @extends MongoRepository
+   */
+  return {
+    ...mongoRepo,
+  };
+};
+
diff --git a/src/tasks/admin/create-realm.js b/src/tasks/admin/create-realm.js
index efc7551..310d3e2 100644
--- a/src/tasks/admin/create-realm.js
+++ b/src/tasks/admin/create-realm.js
@@ -2,14 +2,20 @@ const {success} = require('../../lib/result');
 
 /**
  * @param {RealmRepository} realmRepository The realm repository
+ * @param {RealmLimitsRepository} realmLimitsRepository The realm repository
  * @returns {AdminTasks#createRealm} Task
  */
-module.exports = ({realmRepository}) =>
+module.exports = ({realmRepository, realmLimitsRepository}) =>
   /**
    * @typedef {Function} AdminTasks#createRealm
    * @param {object} args
    * @param {string} args.name The name of the realm
-   * @return {Promise<Result<?RealmModel>>} Realm
+   * @param {object} [args.limits] The limit settings of the realm
+   * @param {number} [args.limits] The limit settings of the realm
+   * @return {Promise<Result<{realm: RealmModel, realmLimits: RealmLimitsModel}>>} Realm
    */
-  async ({name}) =>
-    success(await realmRepository.create({name}));
+  async ({name, limits}) => {
+    const realm = await realmRepository.create({name});
+    const realmLimits = await realmLimitsRepository.create({realmId: realm.id, ...limits});
+    success({realm, realmLimits});
+  }
diff --git a/src/tasks/admin/index.js b/src/tasks/admin/index.js
index d38089b..fc97b0c 100644
--- a/src/tasks/admin/index.js
+++ b/src/tasks/admin/index.js
@@ -15,6 +15,7 @@ const initListUsers = require('./list-users');
 /**
  * @param {AuthTokenRules} authTokenRules The auth token rules
  * @param {RealmRepository} realmRepository The realm repository
+ * @param {RealmLimitsRepository} realmLimitsRepository The realm limits repository
  * @param {AuthRepository} authRepository The auth repository
  * @param {ChannelRepository} channelRepository The channel repository
  * @param {RealtimeConnectionRepository} realtimeConnectionRepository The real-time connection repository
@@ -28,6 +29,7 @@ module.exports = ({
   authRepository,
   channelRepository,
   realmRepository,
+  realmLimitsRepository,
   realtimeConnectionRepository,
   subscriptionRepository,
   userRepository,
@@ -35,7 +37,7 @@ module.exports = ({
 }) => ({
   fetchRealm: initFetchRealm({realmRepository}),
   createChannel: initCreateChannel({realmRepository, channelRepository}),
-  createRealm: initCreateRealm({realmRepository}),
+  createRealm: initCreateRealm({realmRepository, realmLimitsRepository}),
   createRealmToken: initCreateRealmToken({authTokenRules, realmRepository, userRepository, authRepository}),
   createSubscription: initCreateSubscription({
     userRepository,