diff --git a/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst b/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
new file mode 100644
index 00000000000000..f7f998b9eced36
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
@@ -0,0 +1,2 @@
+Use compiler option ``-Og`` in case of clang-cl debug builds on Windows to
+reduce stack usage. Patch by Chris Eibl.
diff --git a/PCbuild/pyproject-clangcl.props b/PCbuild/pyproject-clangcl.props
index 70a81ca7da306c..14843f18823ca9 100644
--- a/PCbuild/pyproject-clangcl.props
+++ b/PCbuild/pyproject-clangcl.props
@@ -50,6 +50,7 @@
       <AdditionalOptions Condition="'$(Platform)' == 'Win32'">-m32 %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="'$(Platform)' == 'x64'">-m64 %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(Configuration) != 'Debug'">-flto=thin %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="$(Configuration) == 'Debug'">%(AdditionalOptions) -Xclang -Og</AdditionalOptions>
       <AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGInstrument'">-fprofile-instr-generate=$(_CLANG_PROFILE_PATH)$(TargetName)_%m.profraw %(AdditionalOptions)</AdditionalOptions>
       <AdditionalOptions Condition="$(SupportPGO) and $(Configuration) == 'PGUpdate'">-fprofile-instr-use=$(OutDir)instrumented\profdata.profdata -Wno-profile-instr-unprofiled %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>