Greta Carlsson (later Nygren, July 7, 1898 – March 19, 1980) was a Swedish freestyle swimmer who competed in the 1912 Summer Olympics.
She was born in Eskilstuna and died in Sundbyberg.
In 1912 she was part of the Swedish team which finished fourth in the 4 x 100 metre freestyle relay event.
In the 100 metre freestyle competition she was eliminated in the first round.