| Conan IV | |
|---|---|
 | |
| Duke of Brittany | |
| Reign | 1156–1166 |
| Predecessor | Odo II & Bertha |
| Successor | Constance |
| Earl of Richmond | |
| Tenure | 1146–1166 |
| Predecessor | Alan |
| Successor | Constance |
| Born | c. 1138 |
| Died | 20 February 1171 |
| Burial | Bégard Monastery |
| Spouse | Margaret of Huntingdon |
| Issue | Constance, Duchess of Brittany William |
| House | Penthièvre |
| Father | Alan, 1st Earl of Richmond |
| Mother | Bertha, Duchess of Brittany |
Conan IV (c. 1138 – 20 February 1171), called the Young, was the Duke of Brittany from 1156 to 1166. He was the son of Bertha, Duchess of Brittany, and her first husband, Alan, Earl of Richmond. Conan IV was his father's heir as Earl of Richmond and his mother's heir as Duke of Brittany.[a] Conan and his daughter Constance would be the only representatives of the House of Penthièvre to rule Brittany.
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