Kollam Rameswaram Mahadeva Temple is an ancient Shiva temple in Kollam, known for its traditional Kerala-style architecture, stone and wood carvings, and historic significance. The presiding deity, Lord Rameswara, faces west. The temple is traditionally counted among the 108 Shiva temples of Kerala.

The temple features small towers on the western and northern sides, a copper flag mast and a rectangular sanctum decorated with traditional carvings. A historic inscription associated with the temple provides information about the medieval history of the region.