Gaëlle Widmer (born 24 December 1977) is a Swiss former professional tennis player.

Widmer, a left-handed player from Neuchâtel, reached a best ranking on tour of 238 in the world.

[1] Her career included a Fed Cup appearance for Switzerland in 2005, when she and Stefanie Vögele were beaten by Austria's Klemenschits twins in a World Group Playoff doubles rubber.

[2] She won a total of five ITF singles titles, before retiring in 2007.