Siddons is a surname. Notable people with the surname include:
- Anne Rivers Siddons (1936-2019), American novelist
- Bill Siddons, manager of the band The Doors (1968–1972)
- Harold Siddons (1922–1963), Northern Irish actor
- Frederick Lincoln Siddons (1864–1931), U.S. federal judge
- Jamie Siddons (born 1964), Australian cricketer
- John Siddons (1927–2016), retired Australian politician
- Michael Siddons (born 1928), Wales Herald of Arms Extraordinary
- Michael John Siddons-Corby (born 1951), English guitarist
- Royston Siddons (1899–1976), Australian industrialist
- Sarah Siddons (1775–1831), British actress
- Dame Sarah Elizabeth Siddons Mair (1846–1941), Scottish suffragette campaigner
- William Siddons (1864–1893), English footballer