Brittany Caroline Haas is an American fiddle player, who also sings and plays the banjo. She is a member of the Boston-based alternative bluegrass band Crooked Still, which is currently on hiatus. She was a regular performer on Live From Here. She tours with the Haas Marshall Walsh trio, and participates in many international fiddlecamps, including the Ossipee Valley Music Festival. As of 2018, she is a member of Hawktail, which includes Paul Kowert and Jordan Tice. The group was formerly known as Haas Kowert Tice. In June 2023 she was announced as the new fiddle player for Americana band Punch Brothers, replacing founding member Gabe Witcher. Her sister Natalie Haas plays cello with a similarly diverse group of musicians.