Margaretha Sigfridsson is a Swedish curler. She plays lead for Stina Viktorsson.
Sigfridsson skipped the Swedish team at the 1997 World Junior Curling Championships, winning the silver medal. Sweden lost in the final game 11-3 to Scotland, skipped by Julia Ewart.
Sigfridsson was the Swedish skip at the 2002 Ford World Curling Championships. Once again, she won a silver medal, and one again lost to Scotland (this time, skipped by Jackie Lockhart) in the final. The score was 6-5.
Sigfridsson returned to the World Championships in 2008, where she played lead for the Swedish team that finished in sixth place.