Alasdair Fraser (born 14 May 1955, Clackmannan, Scotland) is a Scottish fiddler, composer, performer, and recording artist.

Fraser operates Culburnie Records and is a leading artist on the label. He has founded various summer fiddling programs: the Valley of the Moon fiddle camp in California begun in 1984; Sierra Fiddle Camp in California begun in 2006; Crisol de Cuerda, a trad strings program in Spain begun in 2008; and Stringmania!, a trad strings program in Australia in 2016. Adept in various Scottish idioms, in recent years, with cellist Natalie Haas, he has helped reconstruct and revive the Scottish tradition of playing traditional music on violin and cello ("wee fiddle" and "big fiddle"). Fraser lives near Grass Valley, California with his wife and two sons.

He has won the Scottish National Fiddle Championship two times.

In December 2011, Fraser was inducted into the Scottish Traditional Music Hall of Fame.

In November 2023, the violin on which Fraser had performed for the previous forty years was stolen from a rental car in downtown Portland, Oregon, along with his favored bows, a cello, and music notations. The cello was found and returned the same day. The violin and bows were recovered by local music store David Kerr Violin Shop the following month and returned intact to Fraser.