Grigori Gamarnik was Ukraine's first Greco-Roman wrestling world champion. He won the World Lightweight (67 kg) gold medal at the 1955 World Wrestling Championships in Karlsruhe, Germany.
Gamarnik, a USSR wrestling champion in 1953, and 1956–58, was silver medallist at the 1958 World Wrestling Championships (welterweight-73 kg)), and finished fifth at the 1960 Summer Olympics in welterweight Greco-Roman.
Following competition retirement, Gamarnik was the Ukrainian national coach 1970 to 1991. He also served as a President of the international Greco-Roman Federation.
Gamarnik, a FILA International referee, officiated at the 1980 Moscow Olympics. He was one of the organizers of the FILA World Cup in 1983 in Kiev, Ukraine. He was awarded the FILA Gold Star in 1983.