Guémené-sur-Scorff (French pronunciation: [gemne syʁ skɔʁf]; Breton: Ar Gemene) is a commune in the Morbihan department in Brittany in north-western France.

Guémené is situated on the Scorff river and is unusual in that it is a commune without any outlying land and it is bounded by the town boundaries only.

The town is surrounded by wooded hillsides and was the seat of the Dukes of Rohan from the 13th to 15th century.

The old castle was destroyed in the building of new houses and many townhouses contain parts of chimney breasts, turret stones and gateway posts.

One of Brittany's oldest taverns, Les Trois Marchands, has been serving customers since the mid 17th century.