| Sergiu Oleinic | |
| Nationality: | Portuguese |
| Birth Date: | 25 December 1985 |
| Country: | Portugal |
| Weight Class: | –66 kg |
| Worlds Rank: | R16 |
| Worlds Year: | 2015 |
| Worlds Weight: | Men's 66 kg |
| Regionals Type: | EU |
| Regionals Rank: | 5 |
| Regionals Year: | 2015 |
| Regionals Weight: | Men's 66 kg |
| Olympics Rank: | R16 |
| Olympics Year: | 2016 |
| Olympics Weight: | Men's 66 kg |
| Updated: | 7 December 2022 |
Sergiu Oleinic (born 25 December 1985) is a Moldovan-born Portuguese judoka.[1] He competed at the 2016 Summer Olympics in Rio de Janeiro, in the men's 66 kg.[2]
At club level, he represents Sporting CP.