| Gaspard III de Coligny, duc de Châtillon | |
| Nickname: | Maréchal de Châtillon |
| Birth Date: | 26 July 1584 |
| Birth Place: | Montpellier |
| Death Date: | 4 January 1646 (aged 61) |
| Death Place: | Châtillon |
| Allegiance: | France |
| Rank: | Marshal of France |
| Battles: | Franco-Spanish War (1635–1659) Les Avins; Leuven; Arras, 1640' La Marfée; |
| Awards: | Peer of France |
| Relations: | House of Coligny |
Gaspard III de Coligny, duc de Châtillon, (1584 to 1646) was a French Huguenot, who served under Louis XIII, and was appointed Marshal of France in 1622. He was described as "a mediocre general, but absolutely loyal".
Châtillon was born 26 July 1584, in Montpellier, son of François de Coligny (1557–1591) and his wife Marguerite d'Ailly. He was a grandson of the Huguenot leader Admiral Gaspard de Coligny.
On 13 August 1615, he married Anne de Polignac (1598–1651), and they had 4 children. Maurice (1618–1644), (1620–1649), Henriette de Coligny (1618–1673), and Anne, (1624–1680).
He served during the Franco-Spanish War (1635–1659) at Les Avins in 1635, and commanded the Army of Champagne at the Battle of La Marfée on 6 July 1641, where he was defeated. He retired to Châtillon, where he died 4 January 1646.