| Kätlin Sepp | |
| Collegeteam: | Louisiana State University |
| Birth Date: | 8 August 1992 |
| Birth Place: | Tallinn, Estonia |
| Height: | 183 cm |
Kätlin Sepp (born 8 August 1992) is an Estonian backstroke, butterfly and freestyle swimmer. She is 34-time long course and 51-time short course Estonian swimming champion. She has broken 29 Estonian records in swimming.[1]
Her sister Sigrid Sepp is also a swimmer.