diff --git a/README.md b/README.md
index e00f49c..34a0c07 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Prerequisites:
 * [rails_app](rails_app) - Basic Rails API application using Temporal workflows and activities.
 * [saga](saga) - Using undo/compensation using a very simplistic Saga pattern.
 * [sorbet_generic](sorbet_generic) - Proof of concept of how to do _advanced_ Sorbet typing with the SDK.
+* [standalone_activity](standalone_activity) - Execute, start, list, and count Standalone Activities -- Activities run directly from a Client without a Workflow.
 * [updatable_timer](updatable_timer) - Demonstrates a blocking sleep that can be updated.
 * [worker_specific_task_queues](worker_specific_task_queues) - Use a unique Task Queue for each Worker to run a sequence of Activities on the same Worker.
 * [worker_versioning](worker_versioning) - Use the Worker Versioning feature to more easily version your workflows & other code.
diff --git a/standalone_activity/README.md b/standalone_activity/README.md
new file mode 100644
index 0000000..270c303
--- /dev/null
+++ b/standalone_activity/README.md
@@ -0,0 +1,74 @@
+# Standalone Activity
+
+This sample demonstrates [Standalone Activities](https://docs.temporal.io/standalone-activity):
+Activities executed directly from a Client, without a Workflow.
+
+To run, first see [README.md](../README.md) for prerequisites. Standalone Activities require
+Temporal CLI v1.7.0+ and Temporal Server v1.31.0+.
+
+Start a Temporal dev server in one terminal:
+
+    temporal server start-dev
+
+In another terminal, start the Worker from this directory:
+
+    bundle exec ruby worker.rb
+
+The Worker registers `ComposeGreeting` and polls the `standalone-activity-sample` Task Queue.
+No Workflows are required.
+
+## Execute a Standalone Activity
+
+Run an Activity from the Client and block until the result is returned:
+
+    bundle exec ruby execute_activity.rb
+
+Expected output:
+
+    Activity result: Hello, World!
+
+Or use the Temporal CLI:
+
+    temporal activity execute \
+      --type ComposeGreeting \
+      --activity-id standalone-activity-id \
+      --task-queue standalone-activity-sample \
+      --start-to-close-timeout 10s \
+      --input '"Hello"' \
+      --input '"World"'
+
+## Start a Standalone Activity without waiting
+
+Start an Activity, get back an `ActivityHandle`, and fetch the result later:
+
+    bundle exec ruby start_activity.rb
+
+Or use the Temporal CLI:
+
+    temporal activity start \
+      --type ComposeGreeting \
+      --activity-id standalone-activity-id \
+      --task-queue standalone-activity-sample \
+      --start-to-close-timeout 10s \
+      --input '"Hello"' \
+      --input '"World"'
+
+## List Standalone Activities
+
+List Standalone Activity Executions matching a [List Filter](https://docs.temporal.io/list-filter):
+
+    bundle exec ruby list_activities.rb
+
+Or use the Temporal CLI:
+
+    temporal activity list --query "TaskQueue = 'standalone-activity-sample'"
+
+## Count Standalone Activities
+
+Count Standalone Activity Executions matching a List Filter:
+
+    bundle exec ruby count_activities.rb
+
+Or use the Temporal CLI:
+
+    temporal activity count --query "TaskQueue = 'standalone-activity-sample'"
diff --git a/standalone_activity/count_activities.rb b/standalone_activity/count_activities.rb
new file mode 100644
index 0000000..f0387c1
--- /dev/null
+++ b/standalone_activity/count_activities.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'temporalio/client'
+require 'temporalio/env_config'
+
+# Load config and apply defaults
+args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+args[0] ||= 'localhost:7233' # Default address
+args[1] ||= 'default' # Default namespace
+
+client = Temporalio::Client.connect(*args, **kwargs)
+
+# Count Standalone Activity Executions matching a query. Only Standalone
+# Activity Executions are counted -- Activities scheduled inside Workflows
+# are not.
+result = client.count_activities("TaskQueue = 'standalone-activity-sample'")
+puts "Total: #{result.count}"
+result.groups.each do |group|
+  puts "  #{group.group_values.join(',')} => #{group.count}"
+end
diff --git a/standalone_activity/execute_activity.rb b/standalone_activity/execute_activity.rb
new file mode 100644
index 0000000..7175637
--- /dev/null
+++ b/standalone_activity/execute_activity.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'temporalio/client'
+require 'temporalio/env_config'
+require_relative 'my_activities'
+
+# Load config and apply defaults
+args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+args[0] ||= 'localhost:7233' # Default address
+args[1] ||= 'default' # Default namespace
+
+client = Temporalio::Client.connect(*args, **kwargs)
+
+# Execute a Standalone Activity directly from the Client and block until it
+# returns a result. The Activity is durably enqueued on the Server and run by
+# the Worker registered for the same Task Queue.
+result = client.execute_activity(
+  StandaloneActivity::MyActivities::ComposeGreeting,
+  'Hello', 'World',
+  id: 'standalone-activity-id',
+  task_queue: 'standalone-activity-sample',
+  start_to_close_timeout: 10
+)
+puts "Activity result: #{result}"
diff --git a/standalone_activity/list_activities.rb b/standalone_activity/list_activities.rb
new file mode 100644
index 0000000..a80e278
--- /dev/null
+++ b/standalone_activity/list_activities.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'temporalio/client'
+require 'temporalio/env_config'
+
+# Load config and apply defaults
+args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+args[0] ||= 'localhost:7233' # Default address
+args[1] ||= 'default' # Default namespace
+
+client = Temporalio::Client.connect(*args, **kwargs)
+
+# List Standalone Activity Executions on this Task Queue. Only Standalone
+# Activity Executions are returned -- Activities scheduled inside Workflows
+# are not.
+client.list_activities("TaskQueue = 'standalone-activity-sample'").each do |execution|
+  puts "#{execution.activity_id} #{execution.activity_type} #{execution.status}"
+end
diff --git a/standalone_activity/my_activities.rb b/standalone_activity/my_activities.rb
new file mode 100644
index 0000000..89e088a
--- /dev/null
+++ b/standalone_activity/my_activities.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require 'temporalio/activity'
+
+module StandaloneActivity
+  module MyActivities
+    class ComposeGreeting < Temporalio::Activity::Definition
+      def execute(greeting, name)
+        "#{greeting}, #{name}!"
+      end
+    end
+  end
+end
diff --git a/standalone_activity/start_activity.rb b/standalone_activity/start_activity.rb
new file mode 100644
index 0000000..066bbea
--- /dev/null
+++ b/standalone_activity/start_activity.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'temporalio/client'
+require 'temporalio/env_config'
+require_relative 'my_activities'
+
+# Load config and apply defaults
+args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+args[0] ||= 'localhost:7233' # Default address
+args[1] ||= 'default' # Default namespace
+
+client = Temporalio::Client.connect(*args, **kwargs)
+
+# Start a Standalone Activity without waiting for the result. The call returns
+# as soon as the Activity is durably enqueued on the Server.
+handle = client.start_activity(
+  StandaloneActivity::MyActivities::ComposeGreeting,
+  'Hello', 'World',
+  id: 'standalone-activity-id',
+  task_queue: 'standalone-activity-sample',
+  start_to_close_timeout: 10
+)
+puts "Started Activity with id=#{handle.id} run_id=#{handle.run_id}"
+
+# Wait for the result later via the handle.
+puts "Activity result: #{handle.result}"
diff --git a/standalone_activity/worker.rb b/standalone_activity/worker.rb
new file mode 100644
index 0000000..9d9b951
--- /dev/null
+++ b/standalone_activity/worker.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'logger'
+require 'temporalio/client'
+require 'temporalio/env_config'
+require 'temporalio/worker'
+require_relative 'my_activities'
+
+# Load config and apply defaults
+args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+args[0] ||= 'localhost:7233' # Default address
+args[1] ||= 'default' # Default namespace
+
+client = Temporalio::Client.connect(*args, **kwargs, logger: Logger.new($stdout, level: Logger::INFO))
+
+# A Worker for Standalone Activities is configured the same way as one for
+# Workflow Activities: register the Activity classes and run the Worker. No
+# Workflows are required.
+worker = Temporalio::Worker.new(
+  client:,
+  task_queue: 'standalone-activity-sample',
+  activities: [StandaloneActivity::MyActivities::ComposeGreeting]
+)
+
+puts 'Starting worker (ctrl+c to exit)'
+worker.run(shutdown_signals: ['SIGINT'])