diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index b092bd9..d8d6590 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -1,6 +1,6 @@
 #! /usr/bin/env python
 
-"""Regression test.
+"""Regression test driver.
 
 This will find all modules whose name is "test_*" in the test
 directory, and run them.  Various command line options provide
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index 082b918..ace5a88 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -553,6 +553,15 @@
 
 
 class OtherTests(unittest.TestCase):
+    def testUnicodeFilenames(self):
+        zf = zipfile.ZipFile(TESTFN, "w")
+        zf.writestr(u"foo.txt", "Test for unicode filename")
+        zf.writestr(u"fo\xf6.txt", "Test for unicode filename")
+        assert isinstance(zf.infolist()[0].filename, unicode)
+        zf.close()
+        zf = zipfile.ZipFile(TESTFN, "w")
+
+
     def testCreateNonExistentFileForAppend(self):
         if os.path.exists(TESTFN):
             os.unlink(TESTFN)
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 9735a6a..33fcfb1 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -255,12 +255,28 @@
             self.extract_version = max(45, self.extract_version)
             self.create_version = max(45, self.extract_version)
 
+        filename, flag_bits = self._encodeFilenameFlags()
         header = struct.pack(structFileHeader, stringFileHeader,
-                 self.extract_version, self.reserved, self.flag_bits,
+                 self.extract_version, self.reserved, flag_bits,
                  self.compress_type, dostime, dosdate, CRC,
                  compress_size, file_size,
-                 len(self.filename), len(extra))
-        return header + self.filename + extra
+                 len(filename), len(extra))
+        return header + filename + extra
+
+    def _encodeFilenameFlags(self):
+        if isinstance(self.filename, unicode):
+            try:
+                return self.filename.encode('ascii'), self.flag_bits
+            except UnicodeEncodeError:
+                return self.filename.encode('utf-8'), self.flag_bits | 0x800
+        else:
+            return self.filename, self.flag_bits
+
+    def _decodeFilename(self):
+        if self.flag_bits & 0x800:
+            return self.filename.decode('utf-8')
+        else:
+            return self.filename
 
     def _decodeExtra(self):
         # Try to decode the extra field.
@@ -693,6 +709,7 @@
 
             x._decodeExtra()
             x.header_offset = x.header_offset + concat
+            x.filename = x._decodeFilename()
             self.filelist.append(x)
             self.NameToInfo[x.filename] = x
             if self.debug > 2:
@@ -1054,12 +1071,13 @@
                     create_version = zinfo.create_version
 
                 try:
+                    filename, flag_bits = zinfo._encodeFilenameFlags()
                     centdir = struct.pack(structCentralDir,
                      stringCentralDir, create_version,
                      zinfo.create_system, extract_version, zinfo.reserved,
-                     zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
+                     flag_bits, zinfo.compress_type, dostime, dosdate,
                      zinfo.CRC, compress_size, file_size,
-                     len(zinfo.filename), len(extra_data), len(zinfo.comment),
+                     len(filename), len(extra_data), len(zinfo.comment),
                      0, zinfo.internal_attr, zinfo.external_attr,
                      header_offset)
                 except DeprecationWarning:
@@ -1073,7 +1091,7 @@
                      header_offset)
                     raise
                 self.fp.write(centdir)
-                self.fp.write(zinfo.filename)
+                self.fp.write(filename)
                 self.fp.write(extra_data)
                 self.fp.write(zinfo.comment)
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 9c3743f..15e3062 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -49,6 +49,8 @@
 Library
 -------
 
+- Issue #1734346: Support Unicode file names for zipfiles.
+
 - Issue #2581: distutils: Vista UAC/elevation support for bdist_wininst
 
 - Issue #2635: Fix bug in 'fix_sentence_endings' textwrap.fill option,