| Birth Date: | 11 August 1939 |
| Birth Place: | Joniškėlis, Lithuania |
| Death Place: | Kaunas, Lithuania |
| Sport: | Boxing |
| Club: | Žalgiris Kaunas |
| Height: | 185 cm |
| Weight: | 92 kg |
Jonas Čepulis (11 August 1939 – 28 May 2015) was a Lithuanian amateur heavyweight boxer who won a silver medal at the 1968 Olympics. He won his first three bouts by technical knockout (TKO), and lost in the finals by TKO to George Foreman.
Čepulis never won a Soviet title, placing second-third in 1965–66 and 1968 and therefore was not selected for the world and European championships. He won Lithuanian titles in 1963–1964, 1966–1967 and 1969–1970 and retired in 1970 with a record of 203 wins out of 230 bouts. He later worked at a Pergalės factory in Kaunas.
In episode 3 of season two of Better Late Than Never the family of Čepulis has a reunion with George Foreman.