Ioannis Gennimatas (Greek: Ιωάννης Γεννηματάς; 1910–1981) was a Hellenic Army officer who rose to the rank of lieutenant general and the post of Chief of the Hellenic Army General Staff in 1964–65. An ardently right-wing and royalist officer, he is notable for his involvement against the Centre Union party in the 1960s, which led to the political crisis of July 1965.