The 721st Naval Air Group (第七二一海軍航空隊, Dai Nana-Futa-Hito Kaigun Kōkūtai) was an aircraft and airbase garrison unit of the Imperial Japanese Navy (IJN) during the Pacific campaign of World War II.

This air group was organised for use in suicide attacks.

It was otherwise known as the God Thunder Corps (神雷部隊, Jinrai Butai).