| Conan II | |
|---|---|
| Duke of Brittany | |
| Reign | 1 October 1040 – 11 December 1066 |
| Predecessor | Alan III |
| Successor | Hawise and Hoël II |
| Regent | Odo I (1040–1057) |
| Born | c. 1033 |
| Died | 11 December 1066 Château-Gontier |
| House | Rennes |
| Father | Alan III, Duke of Brittany |
| Mother | Bertha of Blois |
Conan II of Rennes (c. 1033 – 11 December 1066) was Duke of Brittany, from 1040 to his death. Conan was the eldest child and heir of Alan III, Duke of Brittany by his wife Bertha of Blois, and member of the House of Rennes. He was the elder brother of Hawise, who succeeded him as suo jure duchess.