Princess Edward of Saxe-Weimar (born Lady Augusta Katherine Lennox; later Gordon-Lennox; 14 January 1827 – 3 April 1904) was a British aristocrat whose marriage to Prince Edward of Saxe-Weimar made her a relative of the British royal family.

[1] Lady Augusta Katherine Lennox was born on 14 January 1827 at Goodwood House to Charles Lennox, 5th Duke of Richmond (1791–1860) and his wife Lady Caroline Paget (1796–1874), daughter of Henry Paget, 1st Marquess of Anglesey.

[2] On 27 November 1851, Augusta Katherine married Prince Edward of Saxe-Weimar morganatically in London.

[citation needed] In 1885, Queen Victoria granted her permission to share her husband's princely title.

She was thereafter known as Her Serene Highness Princess Edward of Saxe-Weimar, albeit only in the United Kingdom, while in Germany she remained only Countess of Dornburg.