Mariefred is a locality situated in Strängnäs Municipality, Södermanland County, Sweden with 7,121 inhabitants in 2023.

[3] The name is derived from that of the former Carthusian monastery in the city, Mariefred Charterhouse, and means "Peace of Mary" (the previous name being Gripsholm).

Swedish pop and jazz singer Lisa Ekdahl was raised in Mariefred.

Mikael Samuelsson, a former professional ice hockey player in the NHL, was born in Mariefred.

Samuelsson is a member of the exclusive Triple Gold Club, having won the Stanley Cup, Olympics, and World Championship.