diff --git a/var/spack/repos/builtin/packages/callflow/package.py b/var/spack/repos/builtin/packages/callflow/package.py
new file mode 100644
index 0000000000..2c374242a0
--- /dev/null
+++ b/var/spack/repos/builtin/packages/callflow/package.py
@@ -0,0 +1,43 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Callflow(PythonPackage):
+    """CallFlow is an interactive visual analysis tool that provides a
+       high-level overview of CCTs together with semantic refinement
+       operations to progressively explore the CCTs."""
+
+    homepage = "https://github.com/LLNL/CallFlow"
+    url      = "https://github.com/LLNL/CallFlow/archive/v1.1.0.tar.gz"
+    git      = 'https://github.com/LLNL/CallFlow.git'
+
+    maintainers = ["bhatiaharsh", "jarusified"]
+
+    version('develop', branch='develop')
+    version('1.1.2', sha256='60d2327843469f42be9366ff31d7a6afc85021af4e38b7d6704b2d8c3da7ed36')
+    version('1.1.1', sha256='a52e6e0697a406dfe391225d3cc3c5c5a12a6c86b68f0f8e47777c79fd45cb28')
+    version('1.1.0', sha256='f8b875eb62fbac04b117e3c23fccff99d768158226a9b7fa222a2b2a6acafa44')
+
+    depends_on('python@3.6:',       type=('build', 'run'))
+    depends_on('py-setuptools',     type=('build', 'run'))
+
+    depends_on('py-numpy',          type=('build', 'run'))
+    depends_on('py-scipy',          type=('build', 'run'))
+    depends_on('py-pandas',         type=('build', 'run'))
+    depends_on('py-hatchet',        type=('build', 'run'))
+    depends_on('py-statsmodels',    type=('build', 'run'))
+    depends_on('py-scikit-learn',   type=('build', 'run'))
+
+    depends_on('py-colorlog',       type=('build', 'run'))
+    depends_on('py-jsonschema',     type=('build', 'run'))
+
+    depends_on('py-matplotlib',     type=('build', 'run'))
+    depends_on('py-networkx',       type=('build', 'run'))
+
+    depends_on('py-ipython',        type=('build', 'run'))
+    depends_on('py-flask-socketio', type=('build', 'run'))
+    depends_on('py-flask-cors',     type=('build', 'run'))