diff --git a/scripts/superbuild/CMakeLists.txt b/scripts/superbuild/CMakeLists.txt
index 839391a9db7..a4506ca2d23 100644
--- a/scripts/superbuild/CMakeLists.txt
+++ b/scripts/superbuild/CMakeLists.txt
@@ -69,6 +69,7 @@ set(LBANN_SB_DEFAULT_INSTALL_PATH_STRATEGY "COMMON"
 # descending into subdirectories.
 lbann_sb_add_packages(
   # Ack, a "third-order" dependency
+  NCCL
   RCCL
 
   # These are "second-order" dependencies
diff --git a/scripts/superbuild/README.md b/scripts/superbuild/README.md
index 88ff9214e26..4bb048e2a73 100644
--- a/scripts/superbuild/README.md
+++ b/scripts/superbuild/README.md
@@ -84,6 +84,8 @@ The following packages are known by the SuperBuild framework:
   algebra library.
 - [JPEG-TURBO](https://github.com/libjpeg-turbo/libjpeg-turbo) - JPEG
   but in turbo mode. Zoom zoom zoom.
+- [NCCL](https://github.com/NVIDIA/nccl) - The NVIDIA Collective
+  Communications Library.
 - [OpenBLAS](https://github.com/xianyi/OpenBLAS.git) - BLAS library
   for when your vendor doesn't do a good job.
 - [OpenCV](https://github.com/opencv/opencv) - Computer vision
@@ -91,6 +93,8 @@ The following packages are known by the SuperBuild framework:
 - [protobuf](https://github.com/protocolbuffers/protobuf.git) - And
   yet *another* serialization format that LBANN (and others) (ab)use
   for model topology description and configuration.
+- [RCCL](https://github.com/ROCm/rccl) - The ROCm Communication
+  Collectives Library.
 - [spdlog](https://github.com/gabime/spdlog) - Fast C++ logging
   library.
 - [zstr](https://github.com/mateidavid/zstr) - C++ ZLib wrapper.
diff --git a/scripts/superbuild/aluminum/CMakeLists.txt b/scripts/superbuild/aluminum/CMakeLists.txt
index c04e78c0100..a8ec264703e 100644
--- a/scripts/superbuild/aluminum/CMakeLists.txt
+++ b/scripts/superbuild/aluminum/CMakeLists.txt
@@ -61,7 +61,7 @@ lbann_sb_add_cmake_extern_pkg(
   OPTIONAL_LANGUAGES CUDA HIP
   GITHUB_URL llnl/Aluminum.git
   GIT_TAG "master"
-  DEPENDS_ON Caliper RCCL)
+  DEPENDS_ON Caliper NCCL RCCL)
 
 set(Aluminum_DIR ${LBANN_SB_Aluminum_PREFIX}
   CACHE INTERNAL "The install prefix of Aluminum.")
diff --git a/scripts/superbuild/cmake/modules/LBANNSuperBuildAddPackages.cmake b/scripts/superbuild/cmake/modules/LBANNSuperBuildAddPackages.cmake
index e57c3ee9690..40437f79da2 100644
--- a/scripts/superbuild/cmake/modules/LBANNSuperBuildAddPackages.cmake
+++ b/scripts/superbuild/cmake/modules/LBANNSuperBuildAddPackages.cmake
@@ -27,14 +27,22 @@ include(CMakeDependentOption)
 
 macro(lbann_sb_default_pkg_option PKG_NAME OPTION_NAME DOC_STR VALUE)
   option(LBANN_SB_FWD_${PKG_NAME}_${OPTION_NAME}
-    "${DOC_STR}"
+    "${PKG_NAME}: ${DOC_STR}"
     ${VALUE})
 endmacro ()
 
+# This assumes PKG_NAME is defined already. No check to ensure this,
+# just don't misuse. :)
+macro(lbann_sb_this_pkg_option OPTNAME DOCSTR DEFVAL)
+  option(LBANN_SB_FWD_${PKG_NAME}_${OPTNAME}
+    "${PKG_NAME}: ${DOCSTR}"
+    ${DEFVAL})
+endmacro ()
+
 macro(lbann_sb_default_cuda_option PKG_NAME OPTION_NAME DOC_STR VALUE)
   cmake_dependent_option(
     LBANN_SB_FWD_${PKG_NAME}_${OPTION_NAME}
-    "${DOC_STR}"
+    "${PKG_NAME}: ${DOC_STR}"
     ${VALUE}
     "LBANN_SB_DEFAULT_CUDA_OPTS"
     OFF)
@@ -43,7 +51,7 @@ endmacro ()
 macro(lbann_sb_default_rocm_option PKG_NAME OPTION_NAME DOC_STR VALUE)
   cmake_dependent_option(
     LBANN_SB_FWD_${PKG_NAME}_${OPTION_NAME}
-    "${DOC_STR}"
+    "${PKG_NAME}: ${DOC_STR}"
     ${VALUE}
     "LBANN_SB_DEFAULT_ROCM_OPTS"
     OFF)
@@ -52,7 +60,7 @@ endmacro ()
 macro(lbann_sb_default_gpu_option PKG_NAME OPTION_NAME DOC_STR VALUE)
   cmake_dependent_option(
     LBANN_SB_FWD_${PKG_NAME}_${OPTION_NAME}
-    "${DOC_STR}"
+    "${PKG_NAME}: ${DOC_STR}"
     ${VALUE}
     "LBANN_SB_DEFAULT_CUDA_OPTS OR LBANN_SB_DEFAULT_ROCM_OPTS"
     OFF)
diff --git a/scripts/superbuild/nccl/CMakeLists.txt b/scripts/superbuild/nccl/CMakeLists.txt
new file mode 100644
index 00000000000..3ce8bb409da
--- /dev/null
+++ b/scripts/superbuild/nccl/CMakeLists.txt
@@ -0,0 +1,174 @@
+################################################################################
+## Copyright (c) 2014-2024, Lawrence Livermore National Security, LLC.
+## Produced at the Lawrence Livermore National Laboratory.
+## Written by the LBANN Research Team (B. Van Essen, et al.) listed in
+## the CONTRIBUTORS file. <lbann-dev@llnl.gov>
+##
+## LLNL-CODE-697807.
+## All rights reserved.
+##
+## This file is part of LBANN: Livermore Big Artificial Neural Network
+## Toolkit. For details, see http://software.llnl.gov/LBANN or
+## https://github.com/LLNL/LBANN.
+##
+## Licensed under the Apache License, Version 2.0 (the "Licensee"); you
+## may not use this file except in compliance with the License.  You may
+## obtain a copy of the License at:
+##
+## http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+## implied. See the License for the specific language governing
+## permissions and limitations under the license.
+################################################################################
+
+# The goal of this package is to enable *basic* builds of NCCL. Any
+# configuration that would require modification to the provided
+# makefile is considered out-of-scope and users needing such
+# configuration should consider a standalone build rather than
+# superbuilding NCCL.
+#
+# Note that the default NCCL makefile is rather rigid. It looks like
+# one _can_ inject flags, but they have a high likelihood of being
+# trampled by the makefile. E.g., the makefiles specifies optimization
+# flags *after* the user injection point, so trying to modify the
+# optimization level manually would be moot.
+
+# Interprets the given variable as a boolean value and converts it to
+# 1 (true) or 0 (false).
+macro(bool_as_num VAR)
+  if (${VAR})
+    set(${VAR} 1)
+  else ()
+    set(${VAR} 0)
+  endif ()
+endmacro ()
+
+lbann_sb_init_extern_pkg(
+  NAME NCCL
+  LANGUAGES C CXX # CUDA <- can't set explicitly; inferred from ${CUDA_HOME}
+  GITHUB_URL NVIDIA/nccl
+  GIT_TAG "master")
+
+# User-facing options
+lbann_sb_this_pkg_option(
+  VERBOSE
+  "Print build commands?"
+  ON)
+bool_as_num(LBANN_SB_FWD_NCCL_VERBOSE)
+
+lbann_sb_this_pkg_option(
+  KEEP
+  "Keep intermediate files generated during compilation"
+  OFF)
+bool_as_num(LBANN_SB_FWD_NCCL_KEEP)
+
+lbann_sb_this_pkg_option(
+  ASAN
+  "Build with address sanitizer enabled"
+  OFF)
+bool_as_num(LBANN_SB_FWD_NCCL_ASAN)
+
+lbann_sb_this_pkg_option(
+  TRACE
+  "Build with tracing enabled"
+  OFF)
+bool_as_num(LBANN_SB_FWD_NCCL_TRACE)
+
+# Debug build?
+string(TOLOWER "${LBANN_SB_${PKG_NAME}_BUILD_TYPE}" _nccl_build_type)
+if (_nccl_build_type STREQUAL "debug")
+  set(_nccl_debug 1)
+else ()
+  set(_nccl_debug 0)
+endif ()
+
+# Prefer a user-specified CUDA path, then check CUDA_HOME
+if (LBANN_SB_FWD_NCCL_CUDA_PATH)
+  set(_nccl_cuda_path_opt
+    "CUDA_HOME=${LBANN_SB_FWD_NCCL_CUDA_PATH}")
+elseif (DEFINED ENV{CUDA_HOME})
+  set(_nccl_cuda_path_opt
+    "CUDA_HOME=$ENV{CUDA_HOME}")
+else ()
+  message(WARNING
+    "You have enabled NCCL package, but CUDA_HOME "
+    "is not available in your environment.")
+endif ()
+
+# Gencode control
+if (LBANN_SB_FWD_NCCL_NVCC_GENCODE)
+  set(_nccl_nvcc_gencode_opt
+    "NVCC_GENCODE=${LBANN_SB_FWD_NCCL_NVCC_GENCODE}")
+elseif (DEFINED $ENV{NVCC_GENCODE})
+  set(_nccl_nvcc_gencode_opt
+    "NVCC_GENCODE=$ENV{NVCC_GENCODE}")
+else ()
+  message(WARNING
+    "You have enabled NCCL package, but you have not set "
+    "the NVCC_GENCODE. This will build all gencodes supported "
+    "by NCCL, which may increase the build time.")
+endif ()
+
+# The build system here is just a set of makefiles.
+find_program(GNU_MAKE_PROGRAM make)
+
+include (ExternalProject)
+ExternalProject_Add(${PKG_NAME}
+  PREFIX "${CMAKE_CURRENT_BINARY_DIR}"
+  ${LBANN_SB_GIT_REPOSITORY_TAG} ${LBANN_SB_${PKG_NAME}_URL}
+  ${LBANN_SB_GIT_TAG_TAG} ${LBANN_SB_${PKG_NAME}_TAG}
+  TMP_DIR "${CMAKE_CURRENT_BINARY_DIR}/tmp"
+  STAMP_DIR "${CMAKE_CURRENT_BINARY_DIR}/stamp"
+
+  SOURCE_DIR "${LBANN_SB_${PKG_NAME}_SOURCE_DIR}"
+  INSTALL_DIR "${LBANN_SB_${PKG_NAME}_PREFIX}"
+
+  GIT_SHALLOW 1
+
+  BUILD_IN_SOURCE 1
+  USES_TERMINAL_BUILD 1
+  LOG_DOWNLOAD 1
+  LOG_UPDATE 1
+  LOG_CONFIGURE 1
+  LOG_BUILD 1
+  LOG_INSTALL 1
+  LOG_TEST 1
+
+  CONFIGURE_COMMAND ""
+
+  BUILD_COMMAND
+  ${GNU_MAKE_PROGRAM}
+  src.build
+  "PREFIX=${LBANN_SB_${PKG_NAME}_PREFIX}"
+  "CC=${LBANN_SB_${PKG_NAME}_C_COMPILER}"
+  "CXX=${LBANN_SB_${PKG_NAME}_CXX_COMPILER}"
+  ${_nccl_cuda_path_opt}
+  ${_nccl_nvcc_gencode_opt}
+  "DEBUG=${_nccl_debug}"
+  "VERBOSE=${LBANN_SB_FWD_NCCL_VERBOSE}"
+  "KEEP=${LBANN_SB_FWD_NCCL_KEEP}"
+  "ASAN=${LBANN_SB_FWD_NCCL_ASAN}"
+  "TRACE=${LBANN_SB_FWD_NCCL_TRACE}"
+  -j${${PKG_NAME}_MAX_MAKE_JOBS}
+
+  INSTALL_COMMAND
+  ${GNU_MAKE_PROGRAM}
+  src.install
+  "PREFIX=${LBANN_SB_${PKG_NAME}_PREFIX}"
+  "CC=${LBANN_SB_${PKG_NAME}_C_COMPILER}"
+  "CXX=${LBANN_SB_${PKG_NAME}_CXX_COMPILER}"
+  ${_nccl_cuda_path_opt}
+  ${_nccl_nvcc_gencode_opt}
+  "DEBUG=${_nccl_debug}"
+  "VERBOSE=${LBANN_SB_FWD_NCCL_VERBOSE}"
+  "KEEP=${LBANN_SB_FWD_NCCL_KEEP}"
+  "ASAN=${LBANN_SB_FWD_NCCL_ASAN}"
+  "TRACE=${LBANN_SB_FWD_NCCL_TRACE}"
+  -j${${PKG_NAME}_MAX_MAKE_JOBS}
+)
+
+set(${PKG_NAME}_DIR ${LBANN_SB_${PKG_NAME}_PREFIX}
+  CACHE INTERNAL "The install prefix of ${PKG_NAME}.")