Gennadi "Genna" Borisovich Sosonko (Russian: Геннадий Борисович Сосонко, Gennady Borisovich Sosonko; born 18 May 1943) is a Russian-born Dutch chess grandmaster and writer.

He has been awarded the title Grandmaster (GM) by FIDE and has twice been Dutch champion.

Born in Troitsk, Russia, Sosonko won the Leningrad juniors' championship in 1958.

Sosonko played for the Dutch team at the Chess Olympiad eleven times, in 1974–84, and 1988–96.

This biographical article relating to a Dutch chess figure is a stub.