Saint-Renan (French pronunciation: [sɛ̃ ʁənɑ̃]; Breton: Lokournan, pronounced [loˈkurnãn]) is a commune in the Finistère department of Brittany in north-western France.

Held every two years, the medieval festival of Saint-Renan, the biggest of the department, highlights the city's heritage.

The Saturday morning market – one of the biggest – is the opportunity to taste local products such as "kouign amann" (cake which name means "sugar and butter" in Breton language), Kig Ha Farz, mushrooms, crepes, cider, caramel, and chitterling sausages etc.

Six artificial lakes are part of the industrial heritage of the city, which was nicknamed "the European capital of tin" in the 1960s.

The churchyard contains a military area dedicated to British aviators from the Royal Air Force who died during the World War II.