| Birth Date: | 4 June 1938 |
| Birth Place: | Tampere, Finland |
| Death Date: | 18 August 2003 (aged 65) |
| Death Place: | Tampere, Finland |
| Height: | 171 cm |
| Weight: | 82–92 kg |
| Sport: | Weightlifting |
| Show-Medals: | yes |
Jouni Kalervo Kailajärvi (4 June 1938 – 18 August 2003) was a Finnish light-heavyweight weightlifter who won bronze medals at the European championships in 1961 and 1962. He competed at the 1960, 1964 and 1968 Olympics with the best result of fifth place in 1960. His younger brother Jaakko was also an Olympic weightlifter.