diff --git a/var/ramble/repos/builtin/modifiers/nccl-tcpxo/modifier.py b/var/ramble/repos/builtin/modifiers/nccl-tcpxo/modifier.py
new file mode 100644
index 000000000..e23a0f877
--- /dev/null
+++ b/var/ramble/repos/builtin/modifiers/nccl-tcpxo/modifier.py
@@ -0,0 +1,77 @@
+# Copyright 2022-2024 The Ramble Authors
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+import os
+from ramble.modkit import *
+
+
+class NcclTcpxo(BasicModifier):
+    """Modifier to ensure NCCL TCPXO is loaded into the execution environment."""
+
+    name = "nccl-tcpxo"
+
+    tags("gpu")
+
+    maintainers("douglasjacobsen")
+
+    mode(
+        "auto", description="Auto detected shell based on config:shell setting"
+    )
+    default_mode("auto")
+
+    def _cos_paths(self):
+        return "/usr/local/nvidia/lib64/nccl-env-profile.sh"
+
+    def _debian_paths(self):
+        return "/var/lib/tcpxo/lib64/nccl-env-profile.sh"
+
+    register_builtin("source_tcpxo", injection_method="prepend")
+
+    def source_tcpxo(self):
+        import ramble.util.shell_utils
+        import ramble.config
+
+        shell = ramble.config.get("config:shell")
+        source_str = ramble.util.shell_utils.source_str(shell)
+        cmds = []
+
+        path_funcs = [self._cos_paths, self._debian_paths]
+
+        for path_func in path_funcs:
+            script = path_func()
+            script_dir = os.path.dirname(script)
+            if shell in ["bash", "sh"]:
+                cmds.extend(
+                    [
+                        f'if [ -d "{script_dir}" ]; then',
+                        f"    NCCL_LIB_DIR={script_dir} {source_str} {script}",
+                        "fi",
+                    ]
+                )
+            elif shell == "csh":
+                cmds.extend(
+                    [
+                        f'if ( -d "{script_dir}" ) then',
+                        f"    NCCL_LIB_DIR={script_dir} {source_str} {script}",
+                        "endif",
+                    ]
+                )
+            elif shell == "fish":
+                cmds.extend(
+                    [
+                        f'if test -d "{script_dir}"',
+                        f"    NCCL_LIB_DIR={script_dir} {source_str} {script}",
+                        "end",
+                    ]
+                )
+            elif shell == "bat":
+                logger.die(
+                    "The nccl-tcpxo modifier is not currently supported for batch shell."
+                )
+
+        return cmds