diff --git a/homeassistant/data_entry_flow.py b/homeassistant/data_entry_flow.py
index 65cf7eb3d36..207328992ab 100644
--- a/homeassistant/data_entry_flow.py
+++ b/homeassistant/data_entry_flow.py
@@ -24,6 +24,7 @@ from .helpers.deprecation import (
     dir_with_deprecated_constants,
 )
 from .helpers.frame import report
+from .loader import async_suggest_report_issue
 from .util import uuid as uuid_util
 
 _LOGGER = logging.getLogger(__name__)
@@ -526,6 +527,7 @@ class FlowHandler:
     MINOR_VERSION = 1
 
     __progress_task: asyncio.Task[Any] | None = None
+    __no_progress_task_reported = False
 
     @property
     def source(self) -> str | None:
@@ -668,6 +670,21 @@ class FlowHandler:
         progress_task: asyncio.Task[Any] | None = None,
     ) -> FlowResult:
         """Show a progress message to the user, without user input allowed."""
+        if progress_task is None and not self.__no_progress_task_reported:
+            self.__no_progress_task_reported = True
+            cls = self.__class__
+            report_issue = async_suggest_report_issue(self.hass, module=cls.__module__)
+            _LOGGER.warning(
+                (
+                    "%s::%s calls async_show_progress without passing a progress task, "
+                    "this is not valid and will break in Home Assistant Core 2024.8. "
+                    "Please %s"
+                ),
+                cls.__module__,
+                cls.__name__,
+                report_issue,
+            )
+
         result = FlowResult(
             type=FlowResultType.SHOW_PROGRESS,
             flow_id=self.flow_id,
diff --git a/tests/test_data_entry_flow.py b/tests/test_data_entry_flow.py
index cafeaaf3ba0..744ae4dc007 100644
--- a/tests/test_data_entry_flow.py
+++ b/tests/test_data_entry_flow.py
@@ -498,7 +498,7 @@ async def test_show_progress_error(hass: HomeAssistant, manager) -> None:
     assert result["reason"] == "error"
 
 
-async def test_show_progress_legacy(hass: HomeAssistant, manager) -> None:
+async def test_show_progress_legacy(hass: HomeAssistant, manager, caplog) -> None:
     """Test show progress logic.
 
     This tests the deprecated version where the config flow is responsible for
@@ -586,6 +586,13 @@ async def test_show_progress_legacy(hass: HomeAssistant, manager) -> None:
     assert result["type"] == data_entry_flow.FlowResultType.CREATE_ENTRY
     assert result["title"] == "Hello"
 
+    # Check for deprecation warning
+    assert (
+        "tests.test_data_entry_flow::TestFlow calls async_show_progress without passing"
+        " a progress task, this is not valid and will break in Home Assistant "
+        "Core 2024.8."
+    ) in caplog.text
+
 
 async def test_show_progress_fires_only_when_changed(
     hass: HomeAssistant, manager