Men-Brial, Maritime lighthouse on Ile de Sein, France.

Men-Brial is a lighthouse on Ile de Sein off the Breton coast, consisting of a round masonry tower approximately 14 meters tall. The structure uses white, red, and green lights to guide ships through coastal waters and plays a role in maritime safety for vessel traffic.

Completed in 1909, the tower replaced a beacon and signal mast that once stood on the same spot. A petition for a light at the harbour entrance had been submitted as early as 1896. On 4 August 1944, German occupying forces left the island after destroying the main Île-de-Sein lighthouse and the Guéveur foghorn, but they did not blow up Men Brial; they used it as a store for bombs intended for the Ar-Men lighthouse, which was never destroyed.

The lighthouse forms part of Brittany's maritime identity, where fishers and sailors have long depended on such structures for navigation. The local community on Ile de Sein views it as an integral part of their daily life at sea.

The tower stands at the entrance to the port of Île-de-Sein, beside large rounded boulders at the edge of a paved area facing the sea. It is reached by ferry from mainland Breton ports; crossings depend on weather and may be cancelled or delayed in rough seas or storms. The lantern and base were being stripped of asbestos and lead from mid-February 2025.

Men Brial shows three different light colours: white reaching 12 nautical miles, red 9 miles and green 7 miles. This tells navigators entering the port of Île-de-Sein that land lies to starboard, on the right of their course. In 1944 the German occupiers did not blow it up; they used it as a store for bombs intended for the Ar-Men lighthouse.