Kerstin Granstedt (born 27 December 1935) is a Swedish orienteering competitor.

She became Relay World Champion in Fiskars in 1966, as a member of the Swedish winning team, with Eivor Steen-Olsson and Gunborg Åhling.

At the 1968 World Orienteering Championships in Linköping Granstedt won an individual bronze medal, and a silver medal in the relay event together with Gun-Britt Nyberg and Ulla Lindkvist.

She set the record for the margin of victory in the overall standings, winning by 20:58.

This biographical article about a Swedish orienteer is a stub.