diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -38,6 +38,7 @@
     cmdutil,
     color,
     context,
+    copies,
     dagparser,
     encoding,
     error,
@@ -1804,6 +1805,18 @@
     ui.write('\n'.join(repo.pathto(p, cwd) for p in sorted(files)))
     ui.write('\n')
 
+@command('debugpathcopies',
+         cmdutil.walkopts,
+         'hg debugcopies REV1 REV2 [FILE]',
+         inferrepo=True)
+def debugpathcopies(ui, repo, rev1, rev2, *pats, **opts):
+    """show copies between two revisions"""
+    ctx1 = scmutil.revsingle(repo, rev1)
+    ctx2 = scmutil.revsingle(repo, rev2)
+    m = scmutil.match(ctx1, pats, opts)
+    for dst, src in copies.pathcopies(ctx1, ctx2, m).items():
+        ui.write('%s -> %s\n' % (src, dst))
+
 @command('debugpeer', [], _('PATH'), norepo=True)
 def debugpeer(ui, path):
     """establish a connection to a peer repository"""
diff --git a/tests/test-completion.t b/tests/test-completion.t
--- a/tests/test-completion.t
+++ b/tests/test-completion.t
@@ -104,6 +104,7 @@
   debugnamecomplete
   debugobsolete
   debugpathcomplete
+  debugpathcopies
   debugpeer
   debugpickmergetool
   debugpushkey
@@ -280,6 +281,7 @@
   debugnamecomplete: 
   debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
   debugpathcomplete: full, normal, added, removed
+  debugpathcopies: include, exclude
   debugpeer: 
   debugpickmergetool: rev, changedelete, include, exclude, tool
   debugpushkey: 
diff --git a/tests/test-help.t b/tests/test-help.t
--- a/tests/test-help.t
+++ b/tests/test-help.t
@@ -1014,6 +1014,8 @@
    debugoptEXP   (no help text available)
    debugpathcomplete
                  complete part or all of a tracked path
+   debugpathcopies
+                 show copies between two revisions
    debugpeer     establish a connection to a peer repository
    debugpickmergetool
                  examine which merge tool is chosen for specified file