| William Berntsen | |
| Full Name: | William Eldred Berntsen |
| Nationality: | Danish |
| Birth Place: | Jersie, Denmark |
| Death Place: | Frederikssund, Denmark |
| Height: | 170 cm |
| Weight: | 70 kg |
| Show-Medals: | yes |
William Eldred Berntsen (25 March 1912 – 14 September 1994) was a Danish competitive sailor and Olympic medalist. He won a silver medal in the 5.5 Metre class at the 1960 Summer Olympics in Rome, together with Søren Hancke and Steen Christensen.[1]