diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -58,6 +58,11 @@
      _('do not perform actions, just print output')),
 ]
 
+confirmopts = [
+    ('', 'confirm', None,
+     _('ask before applying actions')),
+]
+
 remoteopts = [
     ('e', 'ssh', '',
      _('specify ssh command to use'), _('CMD')),
@@ -1997,7 +2002,9 @@
         for subpath in ctx.substate:
             ctx.sub(subpath).addwebdirpath(serverpath, webconf)
 
-def forget(ui, repo, match, prefix, explicitonly, dryrun):
+def forget(ui, repo, match, prefix, explicitonly, dryrun, confirm):
+    if dryrun and confirm:
+        raise error.Abort(_("can't specify --dry-run and --confirm"))
     join = lambda f: os.path.join(prefix, f)
     bad = []
     badfn = lambda x, y: bad.append(x) or match.bad(x, y)
@@ -2013,7 +2020,8 @@
         sub = wctx.sub(subpath)
         try:
             submatch = matchmod.subdirmatcher(subpath, match)
-            subbad, subforgot = sub.forget(submatch, prefix, dryrun=dryrun)
+            subbad, subforgot = sub.forget(submatch, prefix,
+                                           dryrun=dryrun, confirm=confirm)
             bad.extend([subpath + '/' + f for f in subbad])
             forgot.extend([subpath + '/' + f for f in subforgot])
         except error.LookupError:
@@ -2037,9 +2045,14 @@
                     bad.append(f)
 
     for f in forget:
-        if ui.verbose or not match.exact(f):
+        if ui.verbose or not match.exact(f) or confirm:
             ui.status(_('removing %s\n') % match.rel(f))
 
+    if confirm:
+        if ui.promptchoice(_('are you sure you want to forget (yn)?'
+                             '$$ &Yes $$ &No')):
+            raise error.Abort(_('forget canceled'))
+
     if not dryrun:
         rejected = wctx.forget(forget, prefix)
         bad.extend(f for f in rejected if f in match.files())
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -108,6 +108,7 @@
 ]
 
 dryrunopts = cmdutil.dryrunopts
+confirmopts = cmdutil.confirmopts
 remoteopts = cmdutil.remoteopts
 walkopts = cmdutil.walkopts
 commitopts = cmdutil.commitopts
@@ -2039,7 +2040,7 @@
 
 @command(
     '^forget',
-    walkopts + dryrunopts,
+    walkopts + dryrunopts + confirmopts,
     _('[OPTION]... FILE...'), inferrepo=True)
 def forget(ui, repo, *pats, **opts):
     """forget the specified files on the next commit
@@ -2075,9 +2076,10 @@
         raise error.Abort(_('no files specified'))
 
     m = scmutil.match(repo[None], pats, opts)
-    dryrun = opts.get(r'dry_run')
+    dryrun, confirm = opts.get(r'dry_run'), opts.get(r'confirm')
     rejected = cmdutil.forget(ui, repo, m, prefix="",
-                              explicitonly=False, dryrun=dryrun)[0]
+                              explicitonly=False, dryrun=dryrun,
+                              confirm=confirm)[0]
     return rejected and 1 or 0
 
 @command(
diff --git a/tests/test-add.t b/tests/test-add.t
--- a/tests/test-add.t
+++ b/tests/test-add.t
@@ -272,3 +272,32 @@
   [1]
 
   $ cd ..
+
+test --confirm option in forget
+
+  $ hg init forgetconfirm
+  $ cd forgetconfirm
+  $ echo foo > foo
+  $ hg commit -qAm "foo"
+  $ hg forget foo --dry-run --confirm
+  abort: can't specify --dry-run and --confirm
+  [255]
+  $ hg forget foo --confirm -v << EOF
+  > y
+  > EOF
+  removing foo
+  are you sure you want to forget (yn)? y
+  $ hg diff
+  diff -r e63c23eaa88a foo
+  --- a/foo	Thu Jan 01 00:00:00 1970 +0000
+  +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,1 +0,0 @@
+  -foo
+
+  $ hg up -qC .
+  $ hg forget foo --confirm -v << EOF
+  > n
+  > EOF
+  removing foo
+  are you sure you want to forget (yn)? y
+  $ cd ..