diff --git a/app/models/discourse_automation/field.rb b/app/models/discourse_automation/field.rb
index 92f8fd20..15bf115e 100644
--- a/app/models/discourse_automation/field.rb
+++ b/app/models/discourse_automation/field.rb
@@ -112,6 +112,11 @@ def metadata_schema
           "type" => %w[string integer null],
         },
       },
+      "category_notification_level" => {
+        "value" => {
+          "type" => "integer",
+        },
+      },
       "user" => {
         "value" => {
           "type" => "string",
diff --git a/assets/javascripts/discourse/components/fields/da-category-notification-level-field.js b/assets/javascripts/discourse/components/fields/da-category-notification-level-field.js
new file mode 100644
index 00000000..ebf56e3d
--- /dev/null
+++ b/assets/javascripts/discourse/components/fields/da-category-notification-level-field.js
@@ -0,0 +1,3 @@
+import BaseField from "./da-base-field";
+
+export default class CategoryNotficiationLevelField extends BaseField {}
diff --git a/assets/javascripts/discourse/templates/components/fields/da-category-notification-level-field.hbs b/assets/javascripts/discourse/templates/components/fields/da-category-notification-level-field.hbs
new file mode 100644
index 00000000..9a1c634b
--- /dev/null
+++ b/assets/javascripts/discourse/templates/components/fields/da-category-notification-level-field.hbs
@@ -0,0 +1,14 @@
+<section class="field category-notification-level-field">
+  <div class="control-group">
+    {{fields/da-field-label label=label field=field}}
+
+    <div class="controls">
+      {{category-notifications-button
+        value=field.metadata.value
+        onChange=(action (mut field.metadata.value))
+      }}
+
+      {{fields/da-field-description description=description}}
+    </div>
+  </div>
+</section>
\ No newline at end of file
diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 73cdd9ba..c5b6064a 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -141,6 +141,11 @@ en:
             restricted_category:
               label: Category
               description: Optional, allows to limit trigger execution to this category
+        category_created_edited:
+          fields:
+            restricted_category:
+              label: Parent Category
+              description: Optional, allows to limit trigger execution to this category
         pm_created:
           fields:
             restricted_user:
@@ -189,6 +194,15 @@ en:
               label: Topic ID
             post:
               label: Post content
+        group_category_notification_default:
+          fields:
+            group:
+              label: Group
+            notification_level:
+              label: Notification level
+            update_existing_members:
+              label: Update existing members
+              description: Updates the notification level for existing group members
         user_global_notice:
           fields:
             level:
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 7235c54a..8d1bcd4c 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -18,6 +18,9 @@ en:
         title: API call
         description: Making a POST request to trigger an automation
         doc: The POST request should be made to `/automations/:id/trigger.json` with a global API key.
+      category_created_edited:
+        title: Category created/edited
+        description: When a category is created or edited the automation will be triggered
       recurring:
         title: Recurring
       point_in_time:
@@ -110,3 +113,6 @@ en:
         button_text: Done
       add_user_to_group_through_custom_field:
         title: "Add user to group through User Custom Field"
+      group_category_notification_default:
+        title: "Group Category Notification Default"
+        description: "Set the default notification level of a category for members of a group"
diff --git a/lib/discourse_automation/event_handlers.rb b/lib/discourse_automation/event_handlers.rb
index 269c726b..b926a5e1 100644
--- a/lib/discourse_automation/event_handlers.rb
+++ b/lib/discourse_automation/event_handlers.rb
@@ -25,6 +25,21 @@ def self.handle_post_created_edited(post, action)
         end
     end
 
+    def self.handle_category_created_edited(category, action)
+      name = DiscourseAutomation::Triggerable::CATEGORY_CREATED_EDITED
+
+      DiscourseAutomation::Automation
+        .where(trigger: name, enabled: true)
+        .find_each do |automation|
+          restricted_category = automation.trigger_field("restricted_category")
+          if restricted_category["value"].present?
+            next if restricted_category["value"] != category.parent_category_id
+          end
+
+          automation.trigger!("kind" => name, "action" => action, "category" => category)
+        end
+    end
+
     def self.handle_pm_created(topic)
       return if topic.user_id < 0
 
diff --git a/lib/discourse_automation/scripts/group_category_notification_default.rb b/lib/discourse_automation/scripts/group_category_notification_default.rb
new file mode 100644
index 00000000..22f0e7b3
--- /dev/null
+++ b/lib/discourse_automation/scripts/group_category_notification_default.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+DiscourseAutomation::Scriptable::GROUP_CATEGORY_NOTIFICATION_DEFAULT =
+  "group_category_notification_default"
+
+DiscourseAutomation::Scriptable.add(
+  DiscourseAutomation::Scriptable::GROUP_CATEGORY_NOTIFICATION_DEFAULT,
+) do
+  version 1
+
+  field :group, component: :group
+  field :notification_level, component: :category_notification_level
+  field :update_existing_members, component: :boolean
+
+  triggerables %i[category_created_edited]
+
+  script do |context, fields|
+    category_id = context["category"].id
+    group_id = fields.dig("group", "value")
+    notification_level = fields.dig("notification_level", "value")
+
+    unless group = Group.find_by(id: group_id)
+      Rails.logger.warn "[discourse-automation] Couldn’t find group with id #{group_id}"
+      next
+    end
+
+    GroupCategoryNotificationDefault
+      .find_or_initialize_by(group_id: group_id, category_id: category_id)
+      .tap do |gc|
+        gc.notification_level = notification_level
+        gc.save!
+      end
+
+    if fields.dig("update_existing_members", "value")
+      group
+        .users
+        .select(:id, :user_id)
+        .find_in_batches do |batch|
+          user_ids = batch.pluck(:user_id)
+
+          category_users = []
+          existing_users =
+            CategoryUser.where(category_id: category_id, user_id: user_ids).where(
+              "notification_level IS NOT NULL",
+            )
+          skip_user_ids = existing_users.pluck(:user_id)
+
+          batch.each do |group_user|
+            next if skip_user_ids.include?(group_user.user_id)
+            category_users << {
+              category_id: category_id,
+              user_id: group_user.user_id,
+              notification_level: notification_level,
+            }
+          end
+
+          next if category_users.blank?
+
+          CategoryUser.insert_all!(category_users)
+        end
+    end
+  end
+end
diff --git a/lib/discourse_automation/triggers/category_created_edited.rb b/lib/discourse_automation/triggers/category_created_edited.rb
new file mode 100644
index 00000000..f49a5fee
--- /dev/null
+++ b/lib/discourse_automation/triggers/category_created_edited.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+DiscourseAutomation::Triggerable::CATEGORY_CREATED_EDITED = "category_created_edited"
+
+DiscourseAutomation::Triggerable.add(DiscourseAutomation::Triggerable::CATEGORY_CREATED_EDITED) do
+  field :restricted_category, component: :category
+end
diff --git a/plugin.rb b/plugin.rb
index 97ed719b..c2246c4d 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -45,6 +45,7 @@ module ::DiscourseAutomation
     lib/discourse_automation/scripts/close_topic
     lib/discourse_automation/scripts/flag_post_on_words
     lib/discourse_automation/scripts/gift_exchange
+    lib/discourse_automation/scripts/group_category_notification_default
     lib/discourse_automation/scripts/pin_topic
     lib/discourse_automation/scripts/post
     lib/discourse_automation/scripts/send_pms
@@ -54,6 +55,7 @@ module ::DiscourseAutomation
     lib/discourse_automation/scripts/zapier_webhook
     lib/discourse_automation/triggers/after_post_cook
     lib/discourse_automation/triggers/api_call
+    lib/discourse_automation/triggers/category_created_edited
     lib/discourse_automation/triggers/pm_created
     lib/discourse_automation/triggers/point_in_time
     lib/discourse_automation/triggers/post_created_edited
@@ -162,6 +164,14 @@ module ::DiscourseAutomation
     DiscourseAutomation::EventHandlers.handle_post_created_edited(post, :edit)
   end
 
+  on(:category_created) do |category|
+    DiscourseAutomation::EventHandlers.handle_category_created_edited(category, :create)
+  end
+
+  on(:category_edited) do |category|
+    DiscourseAutomation::EventHandlers.handle_category_created_edited(category, :edit)
+  end
+
   Plugin::Filter.register(:after_post_cook) do |post, cooked|
     DiscourseAutomation::EventHandlers.handle_after_post_cook(post, cooked)
   end
diff --git a/spec/scripts/group_category_notification_default_spec.rb b/spec/scripts/group_category_notification_default_spec.rb
new file mode 100644
index 00000000..dd6e4e95
--- /dev/null
+++ b/spec/scripts/group_category_notification_default_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require_relative "../discourse_automation_helper"
+
+describe "GroupCategoryNotificationDefault" do
+  fab!(:category) { Fabricate(:category) }
+  fab!(:group) { Fabricate(:group) }
+
+  before { SiteSetting.discourse_automation_enabled = true }
+
+  context "when using category_created_edited trigger" do
+    fab!(:automation) do
+      Fabricate(
+        :automation,
+        script: DiscourseAutomation::Scriptable::GROUP_CATEGORY_NOTIFICATION_DEFAULT,
+        trigger: DiscourseAutomation::Triggerable::CATEGORY_CREATED_EDITED,
+      )
+    end
+
+    before do
+      automation.upsert_field!(
+        "restricted_category",
+        "category",
+        { value: category.id },
+        target: "trigger",
+      )
+      automation.upsert_field!("group", "group", { value: group.id }, target: "script")
+      automation.upsert_field!(
+        "notification_level",
+        "category_notification_level",
+        { value: 4 },
+        target: "script",
+      )
+    end
+
+    context "when category is allowed" do
+      it "creates a GroupCategoryNotificationDefault record" do
+        subcategory = nil
+        expect { subcategory = Fabricate(:category, parent_category_id: category.id) }.to change {
+          GroupCategoryNotificationDefault.count
+        }.by(1)
+
+        record = GroupCategoryNotificationDefault.last
+        expect(record.category_id).to eq(subcategory.id)
+        expect(record.group_id).to eq(group.id)
+        expect(record.notification_level).to eq(4)
+      end
+
+      it "updates category notification level for existing members" do
+        automation.upsert_field!(
+          "update_existing_members",
+          "boolean",
+          { value: true },
+          target: "script",
+        )
+        user = Fabricate(:user)
+        group.add(user)
+        subcategory = nil
+
+        expect { subcategory = Fabricate(:category, parent_category_id: category.id) }.to change {
+          CategoryUser.count
+        }.by(1)
+
+        record = CategoryUser.last
+        expect(record.category_id).to eq(subcategory.id)
+        expect(record.user_id).to eq(user.id)
+        expect(record.notification_level).to eq(4)
+      end
+    end
+  end
+end
diff --git a/spec/triggers/category_created_edited_spec.rb b/spec/triggers/category_created_edited_spec.rb
new file mode 100644
index 00000000..d7e76581
--- /dev/null
+++ b/spec/triggers/category_created_edited_spec.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require_relative "../discourse_automation_helper"
+
+describe "CategoryCreatedEdited" do
+  before { SiteSetting.discourse_automation_enabled = true }
+
+  fab!(:automation) do
+    Fabricate(:automation, trigger: DiscourseAutomation::Triggerable::CATEGORY_CREATED_EDITED)
+  end
+
+  context "when editing/creating a post" do
+    it "fires the trigger" do
+      category = nil
+
+      list = capture_contexts { category = Fabricate(:category) }
+
+      expect(list.length).to eq(1)
+      expect(list[0]["kind"]).to eq("category_created_edited")
+      expect(list[0]["action"].to_s).to eq("create")
+    end
+
+    context "when category is restricted" do
+      let(:parent_category_id) { Category.first.id }
+      before do
+        automation.upsert_field!(
+          "restricted_category",
+          "category",
+          { value: parent_category_id },
+          target: "trigger",
+        )
+      end
+
+      context "when category is allowed" do
+        it "fires the trigger" do
+          list = capture_contexts { Fabricate(:category, parent_category_id: parent_category_id) }
+
+          expect(list.length).to eq(1)
+          expect(list[0]["kind"]).to eq("category_created_edited")
+        end
+      end
+
+      context "when category is not allowed" do
+        it "doesn’t fire the trigger" do
+          list = capture_contexts { Fabricate(:category) }
+
+          expect(list).to be_blank
+        end
+      end
+    end
+  end
+end