William married Lady Susan Gordon on 7 Oct 1793. Susan (daughter of Alexander Gordon, 4th. Duke of Gordon and Jane Maxwell) was born on 2 Feb 1774; died on 26 Aug 1828. [Group Sheet]

1. Lady Susan Montagu was born on 18 Sep 1797; died on 5 Mar 1870.
2. George Montagu, 6th. Duke of Manchester was born on 9 Jul 1799 in Kimbolton Castle, Kimbolton, Huntingdonshire, England; died on 18 Aug 1855 in Tunbridge Wells, Kent, England; was buried in St. Andrew's, Kimbolton, Huntingdonshire, England.