Sigrid Sepp (born 2 July 1998) is an Estonian backstroke, butterfly and medley swimmer. She competed in the women's 50 metre backstroke event at the 2017 World Aquatics Championships. She is 24-time long course and 15-time short course Estonian swimming champion. She has broken 8 Estonian records in swimming. Sepp currently attends the University of Hawaii, where she is a member of their swimming and diving team. Her sister, Kätlin Sepp, is also a swimmer.