diff --git a/cmake/QtBuildInternalsExtra.cmake.in b/cmake/QtBuildInternalsExtra.cmake.in
index 49d929b6662..2dc906b6c61 100644
--- a/cmake/QtBuildInternalsExtra.cmake.in
+++ b/cmake/QtBuildInternalsExtra.cmake.in
@@ -103,6 +103,10 @@ set(QT_BUILD_EXAMPLES_AS_EXTERNAL "@QT_BUILD_EXAMPLES_AS_EXTERNAL@" CACHE BOOL
 # Propagate usage of ccache.
 set(QT_USE_CCACHE @QT_USE_CCACHE@ CACHE BOOL "Enable the use of ccache")
 
+# Propagate usage of unity build.
+set(QT_UNITY_BUILD @QT_UNITY_BUILD@ CACHE BOOL "Enable unity (jumbo) build")
+set(QT_UNITY_BUILD_BATCH_SIZE "@QT_UNITY_BUILD_BATCH_SIZE@" CACHE STRING "Unity build batch size")
+
 # Propragate the value of WARNINGS_ARE_ERRORS.
 set(WARNINGS_ARE_ERRORS "@WARNINGS_ARE_ERRORS@" CACHE BOOL "Build Qt with warnings as errors")
 
diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index e5b4b36d49c..0572fbbd5b8 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -135,6 +135,13 @@ while(NOT "${configure_args}" STREQUAL "")
         list(POP_FRONT configure_args version)
         is_valid_qt_hex_version("${arg}" "${version}")
         push("-DQT_DISABLE_DEPRECATED_UP_TO=${version}")
+    elseif(arg STREQUAL "-unity-build")
+        push("-DQT_UNITY_BUILD=ON")
+        # QT_UNITY_BUILD_BATCH_SIZE will be set to 8, CMake's default.
+    elseif(arg STREQUAL "-unity-build-batch-size")
+        list(POP_FRONT configure_args unity_build_batch_size)
+        is_non_empty_valid_arg("${arg}" "${unity_build_batch_size}")
+        push("-DQT_UNITY_BUILD_BATCH_SIZE=${unity_build_batch_size}")
     elseif(arg STREQUAL "--")
         # Everything after this argument will be passed to CMake verbatim.
         list(APPEND cmake_args "${configure_args}")
diff --git a/cmake/QtSetup.cmake b/cmake/QtSetup.cmake
index 7c5cfe90c96..a961baa9483 100644
--- a/cmake/QtSetup.cmake
+++ b/cmake/QtSetup.cmake
@@ -331,6 +331,13 @@ if(QT_USE_CCACHE)
     endif()
 endif()
 
+option(QT_UNITY_BUILD "Enable unity (jumbo) build")
+set(QT_UNITY_BUILD_BATCH_SIZE "8" CACHE STRING "Unity build batch size")
+if(QT_UNITY_BUILD)
+    set(CMAKE_UNITY_BUILD ON)
+    set(CMAKE_UNITY_BUILD_BATCH_SIZE "${QT_UNITY_BUILD_BATCH_SIZE}")
+endif()
+
 # We need to clean up QT_FEATURE_*, but only once per configuration cycle
 get_property(qt_feature_clean GLOBAL PROPERTY _qt_feature_clean)
 if(NOT qt_feature_clean)
diff --git a/cmake/configure-cmake-mapping.md b/cmake/configure-cmake-mapping.md
index d4a9ede75ff..796c30c01cf 100644
--- a/cmake/configure-cmake-mapping.md
+++ b/cmake/configure-cmake-mapping.md
@@ -73,6 +73,8 @@ The following table describes the mapping of configure options to CMake argument
 |                                       |                                                   | custom build steps for moc, uic, and rcc.                       |
 |                                       |                                                   | This lacks support in CMake.                                    |
 | -ccache                               | -DQT_USE_CCACHE=ON                                |                                                                 |
+| -unity-build                          | -DQT_UNITY_BUILD=ON                               |                                                                 |
+| -unity-build-batch-size <int>         | -DQT_UNITY_BUILD_BATCH_SIZE=<int>                 |                                                                 |
 | -make-tool <tool>                     | n/a                                               |                                                                 |
 | -mp                                   | n/a                                               |                                                                 |
 | -warnings-are-errors                  | -DWARNINGS_ARE_ERRORS=ON                          |                                                                 |
diff --git a/config_help.txt b/config_help.txt
index 9fc0b380424..c0b0b79b476 100644
--- a/config_help.txt
+++ b/config_help.txt
@@ -140,6 +140,10 @@ Build options:
                          Force use of the GNU ld, GNU gold, LLVM/LLD or mold
                          linker instead of default one (GCC and clang only)
   -ccache .............. Use the ccache compiler cache [no] (Unix only)
+  -unity-build ......... Enable Unity (Jumbo) build
+  -unity-build-batch-size <int>
+                         Maximum number of source files used by the unity build
+                         to create unity source files [8]
 
   -warnings-are-errors . Treat warnings as errors [no; yes if -developer-build]