Gaasterlân-Sleat is a former municipality in the northern Netherlands. Its official name is in West Frisian, the Dutch name being Gaasterland-Sloten (). In 2014 it merged with the municipalities of Lemsterland and Skarsterlân to form the new municipality De Fryske Marren.

Population centres Bakhuizen, Balk, Elahuizen, Harich, Kolderwolde, Mirns, Nijemirdum, Oudega, Oudemirdum, Rijs, Ruigahuizen, Sloten, Sondel and Wijckel.

Demographics In 2010 Dutch: 94.3% Black: 0.4% European: 4.0% Arabs: 0.2% Other non Western: 1.1%:

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