diff --git a/.gitmodules b/.gitmodules
index 732411d4..1c26c90d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -312,11 +312,6 @@
 	path = mmesh/mmesh
 	url = https://github.com/BRL-CAD/mmesh.git
         ignore = dirty
-[submodule "glm/glm"]
-	path = glm/glm
-	url = https://github.com/BRL-CAD/glm.git
-	branch = RELEASE
-        ignore = dirty
 [submodule "clipper2/Clipper2"]
 	path = clipper2/Clipper2
 	url = https://github.com/BRL-CAD/Clipper2.git
diff --git a/dependencies.cmake b/dependencies.cmake
index 6e85b625..58e967a2 100644
--- a/dependencies.cmake
+++ b/dependencies.cmake
@@ -177,11 +177,6 @@ add_project(linenoise GROUPS "BRLCAD")
 # https://github.com/LMDB/lmdb
 add_project(lmdb GROUPS "BRLCAD")
 
-# GLM - header only C++ mathematics library for graphics software based on the
-# OpenGL Shading Language (GLSL) specifications
-# https://github.com/g-truc/glm
-add_project(glm GROUPS "BRLCAD")
-
 # Eigen - linear algebra library
 # https://eigen.tuxfamily.org
 add_project(eigen GROUPS "BRLCAD;APPLESEED")
diff --git a/glm/CMakeLists.txt b/glm/CMakeLists.txt
deleted file mode 100644
index 11c8e763..00000000
--- a/glm/CMakeLists.txt
+++ /dev/null
@@ -1,52 +0,0 @@
-# Decide if we're using glm
-cad_enable(GLM "librt")
-
-bext_enable(GLM)
-
-# Decision made
-
-if (ENABLE_GLM)
-
-  git_submodule_init(glm readme.md)
-
-  RegisterDeps(GLM)
-
-  ExternalProject_Add(GLM_BLD
-    URL "${CMAKE_CURRENT_SOURCE_DIR}/glm"
-    BUILD_ALWAYS ${EXT_BUILD_ALWAYS} ${LOG_OPTS}
-    #PATCH_COMMAND ${PATCH_EXECUTABLE};-E;-p1;${PATCH_OPTIONS};-i;${CMAKE_CURRENT_SOURCE_DIR}/glm.patch
-    CMAKE_ARGS
-    ${BUILD_TYPE_SPECIFIER}
-    -DBIN_DIR=${BIN_DIR}
-    -DLIB_DIR=${LIB_DIR}
-    -DBUILD_STATIC_LIBS=${BUILD_STATIC_LIBS}
-    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-    -DCMAKE_INSTALL_PREFIX=${CMAKE_BUNDLE_INSTALL_PREFIX}
-    -DCMAKE_INSTALL_LIBDIR:PATH=${LIB_DIR}
-    -DCMAKE_INSTALL_RPATH=${CMAKE_BUNDLE_INSTALL_PREFIX}/${LIB_DIR}
-    LOG_CONFIGURE ${EXT_BUILD_QUIET}
-    LOG_BUILD ${EXT_BUILD_QUIET}
-    LOG_INSTALL ${EXT_BUILD_QUIET}
-    LOG_OUTPUT_ON_FAILURE ${EXT_BUILD_QUIET}
-    STEP_TARGETS install
-    )
-
-  TargetInstallDeps(GLM GLM_DEPENDS)
-
-  # Copy the license into position in CMAKE_BUNDLE_INSTALL_PREFIX
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/glm_mit.txt
-    ${DOC_LICENSE_DIR}/glm.txt
-    COPYONLY
-    )
-
-endif (ENABLE_GLM)
-
-# Local Variables:
-# tab-width: 8
-# mode: cmake
-# indent-tabs-mode: t
-# End:
-# ex: shiftwidth=2 tabstop=8
-
diff --git a/glm/glm b/glm/glm
deleted file mode 160000
index 0af55cce..00000000
--- a/glm/glm
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 0af55ccecd98d4e5a8d1fad7de25ba429d60e863
diff --git a/glm/glm.deps b/glm/glm.deps
deleted file mode 100644
index ecdeab5f..00000000
--- a/glm/glm.deps
+++ /dev/null
@@ -1,2 +0,0 @@
-PATCH
-
diff --git a/glm/glm_mit.txt b/glm/glm_mit.txt
deleted file mode 100644
index 221e3df6..00000000
--- a/glm/glm_mit.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-================================================================================
-OpenGL Mathematics (GLM)
---------------------------------------------------------------------------------
-GLM is licensed under The Happy Bunny License or MIT License.  BRL-CAD uses the
-standard MIT license:
-
-================================================================================
-The MIT License
---------------------------------------------------------------------------------
-Copyright (c) 2005 - G-Truc Creation
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.