| Birth Date: | 12 January 1918 |
| Birth Place: | Copenhagen, Denmark |
Grete Ortved Frederiksen (later Therkildsen, January 12, 1918 - September 5, 2007) was a Danish freestyle swimmer who competed in the 1936 Summer Olympics. She was born in Copenhagen. In 1936 she finished seventh in the 400 metre freestyle event.