Lemmer (West Frisian: De Lemmer) is a town in the municipality of De Fryske Marren, in the Dutch province of Friesland. Lemmer lies adjacent to the IJsselmeer and the Frisian Lakes and is one of Friesland's best-known surface water sports locations. Lemmer is a bustling lakeside resort in the summer months and attracts not only day-trippers from surrounding communities such as Emmeloord, Urk, and Joure, but also national and international tourists.
In 2017 the town had 10,225 inhabitants. Residents of Lemmer are called Lemsters. Due to its favorable location in relation to the Randstad, Lemmer attracts many new inhabitants from outside Friesland. As a result, the village has suffered little from the effects of rural flight. The hamlet of Brekkenpolder also belongs to the town, along with most of the hamlet of Tacozijl and a small part of the hamlet of Westend.