diff --git a/apiclient/http.py b/apiclient/http.py
index 8e15e11..94eb266 100644
--- a/apiclient/http.py
+++ b/apiclient/http.py
@@ -26,6 +26,7 @@
     ]
 
 import StringIO
+import base64
 import copy
 import gzip
 import httplib2
@@ -216,6 +217,99 @@
         d['_filename'], d['_mimetype'], d['_chunksize'], d['_resumable'])
 
 
+class MediaInMemoryUpload(MediaUpload):
+  """MediaUpload for a chunk of bytes.
+
+  Construct a MediaFileUpload and pass as the media_body parameter of the
+  method. For example, if we had a service that allowed plain text:
+  """
+
+  def __init__(self, body, mimetype='application/octet-stream',
+               chunksize=256*1024, resumable=False):
+    """Create a new MediaBytesUpload.
+
+    Args:
+      body: string, Bytes of body content.
+      mimetype: string, Mime-type of the file or default of
+        'application/octet-stream'.
+      chunksize: int, File will be uploaded in chunks of this many bytes. Only
+        used if resumable=True.
+      resumable: bool, True if this is a resumable upload. False means upload
+        in a single request.
+    """
+    self._body = body
+    self._mimetype = mimetype
+    self._resumable = resumable
+    self._chunksize = chunksize
+
+  def chunksize(self):
+    """Chunk size for resumable uploads.
+
+    Returns:
+      Chunk size in bytes.
+    """
+    return self._chunksize
+
+  def mimetype(self):
+    """Mime type of the body.
+
+    Returns:
+      Mime type.
+    """
+    return self._mimetype
+
+  def size(self):
+    """Size of upload.
+
+    Returns:
+      Size of the body.
+    """
+    return len(self.body)
+
+  def resumable(self):
+    """Whether this upload is resumable.
+
+    Returns:
+      True if resumable upload or False.
+    """
+    return self._resumable
+
+  def getbytes(self, begin, length):
+    """Get bytes from the media.
+
+    Args:
+      begin: int, offset from beginning of file.
+      length: int, number of bytes to read, starting at begin.
+
+    Returns:
+      A string of bytes read. May be shorter than length if EOF was reached
+      first.
+    """
+    return self._body[begin:begin + length]
+
+  def to_json(self):
+    """Create a JSON representation of a MediaInMemoryUpload.
+
+    Returns:
+       string, a JSON representation of this instance, suitable to pass to
+       from_json().
+    """
+    t = type(self)
+    d = copy.copy(self.__dict__)
+    del d['_body']
+    d['_class'] = t.__name__
+    d['_module'] = t.__module__
+    d['_b64body'] = base64.b64encode(self._body)
+    return simplejson.dumps(d)
+
+  @staticmethod
+  def from_json(s):
+    d = simplejson.loads(s)
+    return MediaInMemoryUpload(base64.b64decode(d['_b64body']),
+                               d['_mimetype'], d['_chunksize'],
+                               d['_resumable'])
+
+
 class HttpRequest(object):
   """Encapsulates a single HTTP request."""
 
diff --git a/tests/test_http.py b/tests/test_http.py
index 2744d9e..67e8aa6 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -32,6 +32,7 @@
 from apiclient.http import HttpRequest
 from apiclient.http import MediaFileUpload
 from apiclient.http import MediaUpload
+from apiclient.http import MediaInMemoryUpload
 from apiclient.http import set_user_agent
 from apiclient.model import JsonModel
 
@@ -332,5 +333,24 @@
     self.assertEqual(callbacks.responses['1'], {'foo': 42})
     self.assertEqual(callbacks.responses['2'], {'baz': 'qux'})
 
+  def test_media_inmemory_upload(self):
+    media = MediaInMemoryUpload('abcdef', 'text/plain', chunksize=10,
+                                resumable=True)
+    self.assertEqual('text/plain', media.mimetype())
+    self.assertEqual(10, media.chunksize())
+    self.assertTrue(media.resumable())
+    self.assertEqual('bc', media.getbytes(1, 2))
+
+  def test_media_inmemory_upload_json_roundtrip(self):
+    media = MediaInMemoryUpload(os.urandom(64), 'text/plain', chunksize=10,
+                                resumable=True)
+    data = media.to_json()
+    newmedia = MediaInMemoryUpload.new_from_json(data)
+    self.assertEqual(media._body, newmedia._body)
+    self.assertEqual(media._chunksize, newmedia._chunksize)
+    self.assertEqual(media._resumable, newmedia._resumable)
+    self.assertEqual(media._mimetype, newmedia._mimetype)
+
+
 if __name__ == '__main__':
   unittest.main()