Gaspard III de Coligny, duc de Châtillon, (26 July 1584 – 4 January 1646) was a French Huguenot, who served under Louis XIII, and was appointed Marshal of France in 1622.

Among his siblings were Henri, Count of Coligny, who died in 1601 in the assault on Ostend, and Françoise (who married René de Talensac, Lord of Londrières).

His maternal grandparents were Charles d'Ailly, Lord of Seigneville, and Françoise de Warty.

[3] 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.

Through his daughter Anne, he was a grandfather of, among others, Eleonore Charlotte of Württemberg-Montbéliard (wife of Silvius II Frederick, Duke of Württemberg-Oels), Elizabeth of Württemberg-Montbéliard (wife of Frederick Ferdinand, Duke of Württemberg-Weiltingen), and Leopold Eberhard, Duke of Württemberg-Montbéliard.