| Birth Date: | 3 December 1894 |
| Birth Place: | Tartu, Estonia |
| Death Date: | 6 August 1974 (aged 79) |
| Death Place: | Tallinn, Estonia |
| Height: | 165 cm |
| Weight: | 60 kg |
| Sport: | Weightlifting |
| Club: | Kalev Tartu |
| Show-Medals: | yes |
Karl Kõiv (3 December 1894 – 24 April 1972) was an Estonian featherweight weightlifter who won a silver medal at the 1922 World Weightlifting Championships and placed seventh at the 1920 Summer Olympics. In 1922–25 he headed the weightlifting section of the Estonian Sports Union. Later he worked as a weightlifting coach and referee, and in this capacity attended the 1936 Summer Olympics.[1]