| Birth Place: | Volgograd, Russian SFSR, Soviet Union |
| Height: | 206 cm |
| Weight: | 110 kg |
| Sport: | Handball |
| Club: | Kaustik Volgograd Ciudad Real, Spain |
| Show-Medals: | yes |
Oleg Nikolayevich Grebnev (Russian: Олег Николаевич Гребнев, born 4 February 1968) is a retired Russian team handball player who competed at the 1992 and 1996 Summer Olympics. He won a gold medal in 1992 and finished fifth in 1996.[1] He also won the world title in 1993 and 1997 and a European title in 1996.[2]