Sir Francis Molyneux Ommanney, (4 October 1774 – 7 November 1840)^[1] was an English politician who represented Barnstaple from 1818 to 1824.^[2]

The second son of Rear Admiral Cornthwaite Ommanney,^[3] and brother of Admiral Sir John Acworth Ommanney he married Georgiana Frances Hawkes in 1801: they had 9 children, including:

• Rev. Edward Aislabie Ommanney (1806–1884)
• Sir Erasmus Ommanney (1814–1904)^[4] himself became an Admiral.^[5]
• Colonel Octavius Ommanney (1816–1901)
• Manaton Collingwood Ommanney (1816–1857)
• Rev. George Druce Wynne Ommanney (1819–1902)
• John Orde Ommanney (d. 1846), who married in 1839 Susanna McTaggart (ca. 1812 – 1902), daughter of Sir John McTaggart, 1st Baronet, and left an only daughter Marianne Susanna Ommanney who married in 1866 Sir Mark Stewart, 1st Baronet.^[6]
• Francis Ommanney, who married Julia Henrietta, daughter of Thomas Metcalfe, of Fitzroy Square, and was father of Montagu Ommanney, head of the Colonial Office from 1900 to 1907.^[7][8]
• Frances Georgiana Ommanney, who married Lieut.-Colonel Edward Ommanney Hollist

A grandson,^[9] became a Rear Admiral.^[10]