Vadim Zadoynov (Russian: Вадим Задойнов, born 24 May 1969) is a Moldovan athlete who specialized in the 400 metres hurdles.
Zadoynov was born in Chişinău.[1] He won the bronze medal for the Soviet Union at the 1988 World Junior Championships.[2] At the 1990 European Championships he finished fourth in the 400 m hurdles and eighth in the 4 × 400 m relay.[3] At the 1992 Olympic Games he was knocked out in the heats.[1]
Zadoynov also competed at the World Championships in 1993, 1995, 1997 and 1999, and only reached the semi-final once; in 1997.[2] He was also knocked out in the heats at the Olympic Games in 1996 and 2000.[1] He finished seventh at the 1994 European Championships and fifth at the 1998 European Championships.[4]
Zadoynov's personal best time was 48.61 seconds, achieved at the 1990 European Championships in Split.[2]