| Conflict: | Siege of Brest |
| Partof: | the Hundred Years’ War |
| Date: | 1386 |
| Place: | Brest, Brittany |
| Result: | English relieved Brest |
| Combatant1: | Duchy of Brittany Kingdom of France |
| Combatant2: | Kingdom of England |
| Commander1: | John IV, Duke of Brittany Olivier de Clisson |
| Commander2: | John RochesThomas AsshendenRelief force: John of Gaunt |
The siege of Brest in 1386 was a siege by forces led by John IV, Duke of Brittany, against English-occupied Brest during the Hundred Years’ War. The siege was relieved by an English army commanded by John of Gaunt, Duke of Lancaster.