diff --git a/hgext/fastcheckout.py b/hgext/fastcheckout.py
--- a/hgext/fastcheckout.py
+++ b/hgext/fastcheckout.py
@@ -26,9 +26,12 @@
     error,
     exchange,
     hg,
+    localrepo,
     merge as mergemod,
+    narrowspec,
     pycompat,
     registrar,
+    repository,
     scmutil,
     util,
     vfs as vfsmod,
@@ -47,6 +50,8 @@
     'fastcheckout',
     [
         ('C', 'clean', False, _('discard uncommitted changes (no backup)')),
+        ('', 'include', [], _('pattern of files to include in checkout')),
+        ('', 'exclude', [], _('pattern of files to not include in checkout')),
         ('', 'purge', False,
          _('purge the working directory of untracked files'),
         ),
@@ -75,6 +80,14 @@
     purge the working directory of both untracked and ignored files, similar
     to running :hg:`purge --all`.
 
+    ``include`` and ``exclude`` define patterns of paths to include and
+    exclude in the working directory, respectively. A path is included in
+    the working directory if it matches a pattern in ``include`` but not
+    ``exclude``. Only ``path`` and ``rootfilesin`` patterns are supported.
+    If the pattern doesn't contain a ``:`` / prefix, it is assumed to be a
+    ``path`` pattern. If ``include`` is not provided, it defaults to all
+    paths.
+
     The source repository must support modern versions of the Mercurial
     wire protocol.
     """
@@ -94,6 +107,9 @@
 
     destvfs = vfsmod.vfs(dest, expandpath=True)
 
+    includepats = narrowspec.parsepatterns(opts['include'])
+    excludepats = narrowspec.parsepatterns(opts['exclude'])
+
     overrides = {
         ('experimental', 'httppeer.advertise-v2'): True,
     }
@@ -102,7 +118,9 @@
         return dofastcheckout(ui, source, rev, destvfs,
                               purge=opts.get('purge', False),
                               purgeall=opts.get('purgeall', False),
-                              clean=opts.get('clean', False))
+                              clean=opts.get('clean', False),
+                              includepats=includepats,
+                              excludepats=excludepats)
 
 def getpeer(ui, source):
     peer = hg.peer(ui, {}, source)
@@ -114,7 +132,11 @@
     return peer
 
 def dofastcheckout(ui, source, rev, destvfs, purge=False, purgeall=False,
-                   clean=False):
+                   clean=False, includepats=None, excludepats=None):
+
+    # Empty sets need to be None to force a full clone/checkout.
+    if not includepats and not excludepats:
+        includepats, excludepats = None, None
 
     createdrepo = False
     peer = None
@@ -124,7 +146,8 @@
         peer = getpeer(ui, source)
         ui.write(_('fetching data from %s\n') % peer.url())
         hg.clone(ui, {}, peer, destvfs.base, pull=True,
-                 update=False, revs=[rev])
+                 update=False, revs=[rev],
+                 storeincludepats=includepats, storeexcludepats=excludepats)
 
         createdrepo = True
 
@@ -145,7 +168,8 @@
         with peer.commandexecutor() as e:
             pullrev = e.callcommand('lookup', {'key': rev}).result()
 
-        exchange.pull(repo, peer, heads=[pullrev])
+        exchange.pull(repo, peer, heads=[pullrev],
+                      includepats=includepats, excludepats=excludepats)
 
     if not createdrepo and (purge or purgeall):
         ui.write(_('purging working directory\n'))
@@ -164,3 +188,9 @@
                                clean=clean, updatecheck='none')
 
         return ret
+
+def featuresetup(ui, features):
+    features.add(repository.NARROW_REQUIREMENT)
+
+def extsetup(ui):
+    localrepo.featuresetupfuncs.add(featuresetup)
diff --git a/tests/test-fastcheckout.t b/tests/test-fastcheckout.t
--- a/tests/test-fastcheckout.t
+++ b/tests/test-fastcheckout.t
@@ -118,6 +118,59 @@
   $ cat dest0/dir1/py3.py
   0
 
+Bad value to --include results in error
+
+  $ hg fastcheckout --include glob:* http://localhost:$HGPORT 6a9937924 badinclude
+  abort: invalid prefix on narrow pattern: glob:*
+  (narrow patterns must begin with one of the following: path:, rootfilesin:)
+  [255]
+
+  $ hg fastcheckout --include glob:* http://localhost:$HGPORT 6a9937924 dest0
+  abort: invalid prefix on narrow pattern: glob:*
+  (narrow patterns must begin with one of the following: path:, rootfilesin:)
+  [255]
+
+Bad value to --exclude results in error
+
+  $ hg fastcheckout --exclude glob:* http://localhost:$HGPORT 6a9937924 badexclude
+  abort: invalid prefix on narrow pattern: glob:*
+  (narrow patterns must begin with one of the following: path:, rootfilesin:)
+  [255]
+
+  $ hg fastcheckout --exclude glob:* http://localhost:$HGPORT 6a9937924 dest0
+  abort: invalid prefix on narrow pattern: glob:*
+  (narrow patterns must begin with one of the following: path:, rootfilesin:)
+  [255]
+
+Narrow file clone works
+
+  $ hg fastcheckout --include path:dir0 http://localhost:$HGPORT 15c769176a narrow-dest0
+  fetching data from http://localhost:$HGPORT
+  new changesets 6a9937924083:15c769176aab
+  updating to 15c769176aab
+  5 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+#if reporevlogstore
+  $ find narrow-dest0/.hg/store -type f | sort
+  narrow-dest0/.hg/store/00changelog.i
+  narrow-dest0/.hg/store/00manifest.i
+  narrow-dest0/.hg/store/data/dir0/child0/c.c.i
+  narrow-dest0/.hg/store/data/dir0/child0/py0.py.i
+  narrow-dest0/.hg/store/data/dir0/child1/py1.py.i
+  narrow-dest0/.hg/store/data/dir0/child1/py2.py.i
+  narrow-dest0/.hg/store/data/dir0/file0.txt.i
+  narrow-dest0/.hg/store/data/dir1/file1.txt.i
+  narrow-dest0/.hg/store/data/dir1/file2.txt.i
+  narrow-dest0/.hg/store/data/dir1/py3.py.i
+  narrow-dest0/.hg/store/data/foo.i
+  narrow-dest0/.hg/store/fncache
+  narrow-dest0/.hg/store/narrowspec
+  narrow-dest0/.hg/store/phaseroots
+  narrow-dest0/.hg/store/undo
+  narrow-dest0/.hg/store/undo.backupfiles
+  narrow-dest0/.hg/store/undo.phaseroots
+#endif
+
 Should not have any server-side errors
 
   $ cat error.log