| Strokes: | Freestyle |
| Club: | Stockholms KK |
| Birth Date: | 10 December 1904 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 20 December 1999 (aged 95) |
| Death Place: | Branchville, New Jersey, United States |
| Show-Medals: | yes |
Carin Maria Nilsson (later Lommerin, 10 December 1904 – 20 December 1999) was a Swedish freestyle swimmer.[1] Aged 15 she won a bronze medal in 4 × 100 m freestyle relay at the 1920 Summer Olympics in Antwerp along with Aina Berg, Emily Machnow and Jane Gylling.