diff --git a/Help/command/execute_process.rst b/Help/command/execute_process.rst
index 799493f6c7..716f457908 100644
--- a/Help/command/execute_process.rst
+++ b/Help/command/execute_process.rst
@@ -90,8 +90,10 @@ Options:
    Use the ANSI codepage.
  ``OEM``
    Use the original equipment manufacturer (OEM) code page.
- ``UTF8``
-   Use the UTF-8 codepage.
+ ``UTF8`` or ``UTF-8``
+   Use the UTF-8 codepage. Prior to CMake 3.11.0, only ``UTF8`` was accepted
+   for this encoding. In CMake 3.11.0, ``UTF-8`` was added for consistency with
+   the `UTF-8 RFC <https://www.ietf.org/rfc/rfc3629>`_ naming convention.
 
 If more than one ``OUTPUT_*`` or ``ERROR_*`` option is given for the
 same pipe the precedence is not specified.
diff --git a/Source/cmProcessOutput.cxx b/Source/cmProcessOutput.cxx
index 617e1ca7d6..83717061f5 100644
--- a/Source/cmProcessOutput.cxx
+++ b/Source/cmProcessOutput.cxx
@@ -13,7 +13,7 @@ cmProcessOutput::Encoding cmProcessOutput::FindEncoding(
   std::string const& name)
 {
   Encoding encoding = Auto;
-  if (name == "UTF8") {
+  if ((name == "UTF8") || (name == "UTF-8")) {
     encoding = UTF8;
   } else if (name == "NONE") {
     encoding = None;
diff --git a/Tests/CMakeLib/testEncoding.cxx b/Tests/CMakeLib/testEncoding.cxx
index 5e40638f7a..11f64098e7 100644
--- a/Tests/CMakeLib/testEncoding.cxx
+++ b/Tests/CMakeLib/testEncoding.cxx
@@ -31,7 +31,7 @@ int main(int argc, char* argv[])
   }
   const std::string encoding(argv[1]);
 #ifdef _WIN32
-  if (encoding == "UTF8") {
+  if ((encoding == "UTF8") || (encoding == "UTF-8")) {
     setEncoding(consoleOut, CP_UTF8);
   } else if (encoding == "ANSI") {
     setEncoding(consoleOut, CP_ACP);
diff --git a/Tests/RunCMake/execute_process/EncodingUTF-8-stderr.txt b/Tests/RunCMake/execute_process/EncodingUTF-8-stderr.txt
new file mode 100644
index 0000000000..0ac68de834
--- /dev/null
+++ b/Tests/RunCMake/execute_process/EncodingUTF-8-stderr.txt
@@ -0,0 +1 @@
+यूनिकोड είναι very здорово!
diff --git a/Tests/RunCMake/execute_process/RunCMakeTest.cmake b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
index 83589bbd0c..cb40b40a48 100644
--- a/Tests/RunCMake/execute_process/RunCMakeTest.cmake
+++ b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
@@ -10,6 +10,7 @@ run_cmake_command(MergeOutputVars ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/Mer
 run_cmake(EncodingMissing)
 if(TEST_ENCODING_EXE)
   run_cmake_command(EncodingUTF8 ${CMAKE_COMMAND} -DTEST_ENCODING=UTF8 -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE} -P ${RunCMake_SOURCE_DIR}/Encoding.cmake)
+  run_cmake_command(EncodingUTF-8 ${CMAKE_COMMAND} -DTEST_ENCODING=UTF-8 -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE} -P ${RunCMake_SOURCE_DIR}/Encoding.cmake)
 endif()
 
 if(EXIT_CODE_EXE)