Lemmer is a town in the municipality of Lemsterland (province of Friesland), in the Netherlands. It has a population of around 10,500 and is one of Friesland's most famous water sport towns.
Lemmer also is a common Luxembourgish last name.
The Ir.D.F. Woudagemaal (D.F. Wouda Steam Pumping Station) is a World Heritage Site.