Ivan Yakovych Horbachevsky (Ukrainian: Іван Якович Горбачевський, Ivan Jakovyč Horbačevskyj; 5 May 1854, Zarubińce – 24 May 1942, Prague) also known as Jan Horbaczewski, Johann Horbaczewski or Ivan Horbaczewski, was an eminent Austrian chemist and politician of Ukrainian origin.