diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -490,6 +490,27 @@ def contains(repo, subset, x):
                     break
     return s
 
+def converted(repo, subset, x):
+    """``converted([id])``
+    Changesets converted from the given identifier in the old repository if
+    present, or all converted changesets if no identifier is specified.
+    """
+
+    # There is exactly no chance of resolving the revision, so do a simple
+    # string compare and hope for the best
+
+    # i18n: "converted" is a keyword
+    rev = None
+    l = getargs(x, 0, 1, _('converted takes one or no arguments'))
+    if l:
+        rev = getstring(l[0], _('converted requires a revision'))
+
+    def _matchvalue(r):
+        source = repo[r].extra().get('convert_revision', None)
+        return source is not None and (rev is None or source.startswith(rev))
+
+    return [r for r in subset if _matchvalue(r)]
+
 def date(repo, subset, x):
     """``date(interval)``
     Changesets within the interval, see :hg:`help dates`.
@@ -1302,6 +1323,7 @@ symbols = {
     "children": children,
     "closed": closed,
     "contains": contains,
+    "converted": converted,
     "date": date,
     "desc": desc,
     "descendants": descendants,
diff --git a/tests/test-convert.t b/tests/test-convert.t
--- a/tests/test-convert.t
+++ b/tests/test-convert.t
@@ -396,3 +396,52 @@ test bogus URL
   $ hg convert -q bzr+ssh://foobar@selenic.com/baz baz
   abort: bzr+ssh://foobar@selenic.com/baz: missing or unsupported repository
   [255]
+
+test revset converted() lookup
+
+  $ hg --config convert.hg.saverev=True convert a c  
+  initializing destination c repository
+  scanning source...
+  sorting...
+  converting...
+  4 a
+  3 b
+  2 c
+  1 d
+  0 e
+  $ echo f > c/f
+  $ hg -R c ci -d'0 0' -Amf
+  adding f
+  created new head
+  $ hg -R c log -r "converted(09d945a62ce6)"
+  changeset:   1:98c3dd46a874
+  user:        test
+  date:        Thu Jan 01 00:00:01 1970 +0000
+  summary:     b
+  
+  $ hg -R c log -r "converted()"
+  changeset:   0:31ed57b2037c
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     a
+  
+  changeset:   1:98c3dd46a874
+  user:        test
+  date:        Thu Jan 01 00:00:01 1970 +0000
+  summary:     b
+  
+  changeset:   2:3b9ca06ef716
+  user:        test
+  date:        Thu Jan 01 00:00:02 1970 +0000
+  summary:     c
+  
+  changeset:   3:4e0debd37cf2
+  user:        test
+  date:        Thu Jan 01 00:00:03 1970 +0000
+  summary:     d
+  
+  changeset:   4:9de3bc9349c5
+  user:        test
+  date:        Thu Jan 01 00:00:04 1970 +0000
+  summary:     e
+