Château de Châtillon-Coligny, Renaissance castle ruins in Châtillon-Coligny, France.

Château de Châtillon-Coligny is a castle in Châtillon-Coligny, in the Loiret département of central France. Its medieval keep, a polygonal tower with six faces and buttresses in alternate corners, rises above the Loing valley. A Renaissance orangery and a sculpted well attributed to Jean Goujon survive, alongside a house built in 1854.

The site saw successive fortifications starting with a medieval stronghold, followed by a Renaissance residence built by the Coligny family. A 19th-century mansion replaced parts of the earlier structure in 1854, though castle foundations remain visible beneath.

The Coligny family gave the site its name; the land passed to the House of Coligny in 1437. Admiral Gaspard II de Coligny moved the collegiate church and the parish into a new church in the town in 1552. The gardens of the 17th century kept the Renaissance layout, with the great parterre at the centre of the arrangement of castle, fortified town and lower courtyard.

The property is private and not open to regular visitors, though outer walls are visible from nearby roads. Those interested in the site should contact the local tourism office in town for possible arrangements or guided visits.

The keep's six-sided plan has buttresses in alternating corners and rustic bossages on its stonework, details visible from outside the fence. The orangery below it is described as the most beautiful built in 16th-century France. The sculpted well, attributed to Jean Goujon, survives alongside the keep.