Hennadiy Valentynovych Avdyeyenko (Ukrainian: Геннадій Валентинович Авдєєнко) (born November 4, 1963, in Odessa) is a retired high jumper who represented the USSR and later Ukraine.

His personal best was only 2.25 m and he had placed 6th at the main tryout meeting, the 1983 Spartakiad; however, high jump coach Kęstutis Šapka and team coach Igor Ter-Ovanesyan lobbied to have him included in the team.

[2] In the World Championship final, up against thirteen athletes with bests of 2.30 m or better, Avdyeyenko improved his personal best by 7 centimetres to win an unexpected gold medal, beating the United States' Tyke Peacock on countback.

[3][4] He won another silver medal at the outdoor championships that year, again jumping 2.38 m and tying with Paklin; this time the tie did not have to be broken, as Patrik Sjöberg won on countback and the gold medal was thus not at stake.

[6] Avdyeyenko graduated from Odessa Polytechnic Institute and worked as an expert in refrigerating equipment.