diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 45cee151..17e70ade 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -70,26 +70,6 @@ jobs:
       - name: Build Agent STT SDK
         run: make build-agent-stt
 
-  test-flow:
-    name: Test Flow SDK
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: make install-dev-flow
-      - name: Lint Flow SDK
-        run: make lint-flow
-      - name: Test Flow SDK
-        run: make test-flow
-      - name: Build Flow SDK
-        run: make build-flow
-
   test-voice:
     name: Test Voice Agent SDK
     runs-on: ubuntu-latest
diff --git a/Makefile b/Makefile
index b6710e4e..61afe473 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # Makefile for Speechmatics Python SDKs
 
 .PHONY: help
-.PHONY: test-all test-rt test-batch test-agent-stt test-flow test-tts test-voice
+.PHONY: test-all test-rt test-batch test-agent-stt test-tts test-voice
 .PHONY: format-all format-rt format-batch format-agent-stt format-flow format-tts format-voice
 .PHONY: lint-all lint-rt lint-batch lint-agent-stt lint-flow lint-tts lint-voice
 .PHONY: type-check-all type-check-rt type-check-batch type-check-agent-stt type-check-flow type-check-tts type-check-voice
@@ -18,7 +18,6 @@ help:
 	@echo "  test-rt           Run tests for RT SDK"
 	@echo "  test-batch        Run tests for Batch SDK"
 	@echo "  test-agent-stt    Run tests for Agent STT SDK"
-	@echo "  test-flow         Run tests for Flow SDK"
 	@echo "  test-tts          Run tests for TTS SDK"
 	@echo "  test-voice        Run tests for Voice Agent SDK"
 	@echo ""
@@ -69,7 +68,7 @@ help:
 	@echo ""
 
 # Testing targets
-test-all: test-rt test-batch test-agent-stt test-flow test-tts test-voice
+test-all: test-rt test-batch test-agent-stt test-tts test-voice
 test-rt:
 	pytest tests/rt/ -v -s
 
@@ -79,9 +78,6 @@ test-batch:
 test-agent-stt:
 	pytest tests/agent_stt/ -v -s
 
-test-flow:
-	pytest tests/flow/ -v -s
-
 test-tts:
 	pytest tests/tts/ -v -s
 
diff --git a/sdk/flow/MIGRATION.md b/sdk/flow/MIGRATION.md
index 5813ec28..fcc04464 100644
--- a/sdk/flow/MIGRATION.md
+++ b/sdk/flow/MIGRATION.md
@@ -1,5 +1,7 @@
 # Flow SDK Migration Guide
 
+> **⚠️ DEPRECATED**: `speechmatics-flow` is deprecated and no longer maintained. The Flow API is no longer available and this SDK will not work regardless of version.
+
 This guide helps users migrate from the legacy Speechmatics Flow Client (`speechmatics-flow`) to the new Speechmatics Flow SDK (`speechmatics-flow`). The new SDK provides a cleaner API, better error handling, and improved performance.
 
 ## Significant Changes
diff --git a/sdk/flow/README.md b/sdk/flow/README.md
index 39250508..829269d3 100644
--- a/sdk/flow/README.md
+++ b/sdk/flow/README.md
@@ -3,6 +3,8 @@
 [![PyPI](https://img.shields.io/pypi/v/speechmatics-flow)](https://pypi.org/project/speechmatics-flow/)
 ![PythonSupport](https://img.shields.io/badge/Python-3.9%2B-green)
 
+> **⚠️ DEPRECATED**: `speechmatics-flow` is deprecated and no longer maintained. The Flow API is no longer available and this SDK will not work regardless of version.
+
 Async Python client for the Speechmatics Flow API - Real-time conversational AI.
 
 ## Features
diff --git a/sdk/flow/pyproject.toml b/sdk/flow/pyproject.toml
index 5c7e80ad..ea19115e 100644
--- a/sdk/flow/pyproject.toml
+++ b/sdk/flow/pyproject.toml
@@ -12,7 +12,7 @@ license = "MIT"
 requires-python = ">=3.9"
 dependencies = ["websockets>=10.0"]
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 7 - Inactive",
     "Intended Audience :: Developers",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.9",
diff --git a/sdk/flow/speechmatics/flow/__init__.py b/sdk/flow/speechmatics/flow/__init__.py
index f136c714..9223e63c 100644
--- a/sdk/flow/speechmatics/flow/__init__.py
+++ b/sdk/flow/speechmatics/flow/__init__.py
@@ -1,3 +1,5 @@
+import warnings
+
 __version__ = "0.0.0"
 
 from ._async_client import AsyncClient
@@ -59,3 +61,10 @@
     "ConversationEndedException",
     "ConversationError",
 ]
+
+warnings.warn(
+    "speechmatics-flow is deprecated and no longer maintained. "
+    "The Flow API is no longer available and this SDK will not work regardless of version.",
+    DeprecationWarning,
+    stacklevel=2,
+)
diff --git a/tests/flow/test_setup.py b/tests/flow/test_setup.py
deleted file mode 100644
index 4fc590d2..00000000
--- a/tests/flow/test_setup.py
+++ /dev/null
@@ -1,2 +0,0 @@
-def test_setup():
-    assert True