diff --git a/environments/opteesp/env.cmake b/environments/opteesp/env.cmake
new file mode 100644
index 0000000..1a5c670
--- /dev/null
+++ b/environments/opteesp/env.cmake
@@ -0,0 +1,23 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+#-------------------------------------------------------------------------------
+#  Environment file for deployments to opteesp.  This is a cross-compiled
+#  enviroment where built executables run within secure partitions
+#  with optee acting as the secure partition manager.
+#-------------------------------------------------------------------------------
+set(TS_ENV "opteesp" CACHE STRING "Environment identifier")
+
+# Default to using the base toolcahin file for the enviroment
+set(TS_BASE_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/default_toolchain_file.cmake" CACHE STRING "Base toolchainfile")
+
+# Replicate in environment variable for access from child cmake contexts
+set(ENV{TS_BASE_TOOLCHAIN_FILE} "${TS_BASE_TOOLCHAIN_FILE}")
+
+# Set toolchain files to use
+set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/default_toolchain_file.cmake" CACHE STRING "Toolchain file")
+set(TS_EXTERNAL_LIB_TOOLCHAIN_FILE "${CMAKE_TOOLCHAIN_FILE}" CACHE STRING "External lib Toolchain file")