diff --git a/bin/buckd b/bin/buckd
index 14a6c2e..0f4441f 100755
--- a/bin/buckd
+++ b/bin/buckd
@@ -9,4 +9,5 @@ while [ -h "$BUCK_PATH" ]; do
 done
 BUCK_DIR=$(dirname "$BUCK_PATH")
 
-PYTHONPATH="$BUCK_DIR"/../third-party/nailgun exec python "$BUCK_DIR"/../programs/buckd.py "$@"
+PYTHON=$(command -v python2 python | head -1)
+PYTHONPATH="$BUCK_DIR"/../third-party/nailgun exec $PYTHON "$BUCK_DIR"/../programs/buckd.py "$@"
diff --git a/build.xml b/build.xml
index 247747a..657b54f 100644
--- a/build.xml
+++ b/build.xml
@@ -207,7 +207,7 @@
   </target>
 
   <target name="python-get-prefix">
-    <exec executable="python" failonerror="true" outputproperty="python.prefix" logError="true">
+    <exec executable="python2" failonerror="true" outputproperty="python.prefix" logError="true">
       <arg value="-c" />
       <arg value="import distutils.sysconfig; print(distutils.sysconfig.PREFIX)" />
     </exec>
@@ -679,7 +679,7 @@
   <target name="py-test" description="runs the Python tests" depends="buck-py-test, class-loader-py-test, log-rotation-py-test, pathlib-py-test, zip-munger-py-test, buck-tool-py-test, scandir-py-test" />
 
   <target name="buck-py-test" description="tests the BUCK parser">
-    <exec executable="python" failonerror="true" dir="${basedir}/src/com/facebook/buck/json">
+    <exec executable="python2" failonerror="true" dir="${basedir}/src/com/facebook/buck/json">
       <!-- The py folder is actually a python package, so use module import style here. -->
       <env key="PYTHONPATH" path="${buck.pythonpath}" />
       <arg value="-m" />
@@ -690,21 +690,21 @@
   </target>
 
   <target name="class-loader-py-test" description="tests BUCK's class loader setup">
-      <exec executable="python" failonerror="true">
+      <exec executable="python2" failonerror="true">
           <env key="PYTHONPATH" path="${buck.pythonpath}" />
           <arg value="test/com/facebook/buck/cli/bootstrapper/class_loader_test.py" />
       </exec>
   </target>
 
   <target name="log-rotation-py-test" description="tests BUCK's logger setup">
-    <exec executable="python" failonerror="true">
+    <exec executable="python2" failonerror="true">
       <env key="PYTHONPATH" path="${buck.pythonpath}" />
       <arg value="test/com/facebook/buck/log/test_log_rotation.py" />
     </exec>
   </target>
 
   <target name="pathlib-py-test" description="tests pathlib.py">
-    <exec executable="python" failonerror="true" dir="${pathlib.dir}">
+    <exec executable="python2" failonerror="true" dir="${pathlib.dir}">
       <!-- Needed on Python 2.6. -->
       <env key="PYTHONPATH" path="${unittest2.dir}" />
       <arg value="test_pathlib.py" />
@@ -712,7 +712,7 @@
   </target>
 
   <target name="scandir-py-test" description="tests scandir.py">
-    <exec executable="python" failonerror="true" dir="${scandir.dir}/test">
+    <exec executable="python2" failonerror="true" dir="${scandir.dir}/test">
       <!-- Needed on Python 2.6. -->
       <env key="PYTHONPATH" path="${unittest2.dir}" />
       <arg value="run_tests.py" />
@@ -720,14 +720,14 @@
   </target>
 
   <target name="zip-munger-py-test" description="tests munger.py">
-    <exec executable="python" failonerror="true">
+    <exec executable="python2" failonerror="true">
       <env key="PYTHONPATH" path="${basedir}" />
       <arg value="py/buck/zip/test_munger.py" />
     </exec>
   </target>
 
   <target name="buck-tool-py-test" description="tests buck_tool.py">
-    <exec executable="python" failonerror="true">
+    <exec executable="python2" failonerror="true">
       <env key="PYTHONPATH" path="${buck.pythonpath}" />
       <arg value="programs/test_buck_tool.py" />
     </exec>
@@ -853,7 +853,7 @@
   </target>
 
   <target name="missing-test-files-check">
-    <exec dir="${user.dir}/scripts" executable="python" failonerror="true">
+    <exec dir="${user.dir}/scripts" executable="python2" failonerror="true">
       <arg line="verify-test-files.py" />
     </exec>
   </target>
diff --git a/docs/presentations/droidcon-nyc-2014/images/create_images.py b/docs/presentations/droidcon-nyc-2014/images/create_images.py
index cd6f6b9..27e02c5 100755
--- a/docs/presentations/droidcon-nyc-2014/images/create_images.py
+++ b/docs/presentations/droidcon-nyc-2014/images/create_images.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 """
 This exports a bunch of images from the base-dependency-diagram.graffle file
 using py-appscript:
diff --git a/docs/soy2html.py b/docs/soy2html.py
index ea55ed3..9bc7d31 100644
--- a/docs/soy2html.py
+++ b/docs/soy2html.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # This script is designed to be invoked by soy2html.sh.
 # Usage:
diff --git a/programs/buck.py b/programs/buck.py
index 33be17b..d1b8cea 100755
--- a/programs/buck.py
+++ b/programs/buck.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 from __future__ import print_function
 import os
 import signal
diff --git a/programs/buckd.py b/programs/buckd.py
index 8ef3d06..3458bbe 100755
--- a/programs/buckd.py
+++ b/programs/buckd.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 from __future__ import print_function
 import os
 import sys
diff --git a/programs/timing.py b/programs/timing.py
index 60c1044..5def8ac 100644
--- a/programs/timing.py
+++ b/programs/timing.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import ctypes
 import platform
diff --git a/programs/tracing.py b/programs/tracing.py
index 6027013..02adbda 100644
--- a/programs/tracing.py
+++ b/programs/tracing.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import errno
 import glob
diff --git a/scripts/assert_code_coverage.py b/scripts/assert_code_coverage.py
index 8f6a772..3d68ab7 100644
--- a/scripts/assert_code_coverage.py
+++ b/scripts/assert_code_coverage.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import xml.etree.ElementTree as ElementTree
 import os
diff --git a/scripts/autofix_lint.py b/scripts/autofix_lint.py
index e7d5a62..ea127e3 100755
--- a/scripts/autofix_lint.py
+++ b/scripts/autofix_lint.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import argparse
 import re
diff --git a/scripts/intellij/generate_grammar_kit.py b/scripts/intellij/generate_grammar_kit.py
index afb908a..b49607b 100644
--- a/scripts/intellij/generate_grammar_kit.py
+++ b/scripts/intellij/generate_grammar_kit.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import subprocess
 import os
diff --git a/scripts/perf_test_hg.py b/scripts/perf_test_hg.py
index e7c8427..9c1502f 100755
--- a/scripts/perf_test_hg.py
+++ b/scripts/perf_test_hg.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 """Performance test to make sure rule keys are unaffected by absolute paths.
 
 The general algorithm is:
diff --git a/scripts/verify-javadoc.py b/scripts/verify-javadoc.py
index 60cbbc2..ff74c3b 100755
--- a/scripts/verify-javadoc.py
+++ b/scripts/verify-javadoc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Examines the output from running Javadoc via Ant and checks to see if any
 # warnings were emitted. If so, fail the build unless the warning is in the
diff --git a/src/com/facebook/buck/apple/project_generator/build-with-buck.st b/src/com/facebook/buck/apple/project_generator/build-with-buck.st
index f596c6d..2ba6c7c 100644
--- a/src/com/facebook/buck/apple/project_generator/build-with-buck.st
+++ b/src/com/facebook/buck/apple/project_generator/build-with-buck.st
@@ -1,7 +1,7 @@
 set -e
 cd <repo_root>
 
-BUILD_WITH_BUCK_COMMAND=`python <path_to_build_with_buck_py> <repo_root> <path_to_buck> -- "<build_flags>" <escaped_build_target> <buck_dwarf_flavor> <buck_dsym_flavor>`
+BUILD_WITH_BUCK_COMMAND=`python2 <path_to_build_with_buck_py> <repo_root> <path_to_buck> -- "<build_flags>" <escaped_build_target> <buck_dwarf_flavor> <buck_dsym_flavor>`
 echo $BUILD_WITH_BUCK_COMMAND
 
 BUCK_BUNDLE_OUTPUT_PATH=`eval $BUILD_WITH_BUCK_COMMAND | awk 'NR>1 {print $2}'`
@@ -22,9 +22,9 @@ if [ "$DEBUG_INFORMATION_FORMAT" = "dwarf-with-dsym" ] || [ "<force_dsym>" == "t
     export LC_ALL=C
     sed -i '' 's|<comp_dir>|<padded_source_dir>|g' <resolved_dsym_destination>/Contents/Resources/DWARF/<binary_name>
 
-    python <path_to_fix_uuid_script> --verbose <resolved_bundle_destination> <resolved_dsym_destination> <binary_name>
+    python2 <path_to_fix_uuid_script> --verbose <resolved_bundle_destination> <resolved_dsym_destination> <binary_name>
 else
     echo "DWARF MODE"
     echo "Absolutifying object file paths in binary: $BUCK_BUNDLE_OUTPUT_PATH/<binary_name>"
     <path_to_buck> machoutils absolutify_object_paths --binary $BUCK_BUNDLE_OUTPUT_PATH/<binary_name> --output <resolved_bundle_destination>/<binary_name> --old_compdir "<comp_dir>" --new_compdir "<new_comp_dir>"
-fi
\ No newline at end of file
+fi
diff --git a/src/com/facebook/buck/python/make_pex.py b/src/com/facebook/buck/python/make_pex.py
index 0359eef..ff54c34 100755
--- a/src/com/facebook/buck/python/make_pex.py
+++ b/src/com/facebook/buck/python/make_pex.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 from __future__ import print_function
 import contextlib
diff --git a/test/com/facebook/buck/android/testdata/android_project/java/com/preprocess/convert.py b/test/com/facebook/buck/android/testdata/android_project/java/com/preprocess/convert.py
index 84276d4..15239c6 100755
--- a/test/com/facebook/buck/android/testdata/android_project/java/com/preprocess/convert.py
+++ b/test/com/facebook/buck/android/testdata/android_project/java/com/preprocess/convert.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 import sys
 import os
 import zipfile
diff --git a/test/com/facebook/buck/rage/testdata/interactive_report/extra.py b/test/com/facebook/buck/rage/testdata/interactive_report/extra.py
index f899a7e..69e4bc8 100755
--- a/test/com/facebook/buck/rage/testdata/interactive_report/extra.py
+++ b/test/com/facebook/buck/rage/testdata/interactive_report/extra.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 from __future__ import print_function
 import argparse
diff --git a/third-party/nailgun/pynailgun/ng.py b/third-party/nailgun/pynailgun/ng.py
index 577e868..49a0521 100755
--- a/third-party/nailgun/pynailgun/ng.py
+++ b/third-party/nailgun/pynailgun/ng.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright 2004-2015, Martian Software, Inc.
 #
diff --git a/third-party/py/pywatchman/setup.py b/third-party/py/pywatchman/setup.py
index 243e83f..4c4d277 100755
--- a/third-party/py/pywatchman/setup.py
+++ b/third-party/py/pywatchman/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # vim:ts=4:sw=4:et:
 
 try:
diff --git a/third-party/py/pywatchman/tests/tests.py b/third-party/py/pywatchman/tests/tests.py
index 02d9a0b..92492e9 100755
--- a/third-party/py/pywatchman/tests/tests.py
+++ b/third-party/py/pywatchman/tests/tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # vim:ts=4:sw=4:et:
 from __future__ import absolute_import
 from __future__ import division