Divisions: Collegiate, Varsity, Junior Varsity, Middle School, Elementary
Competition Type: Individual, 3 preliminary rounds and 1 final round, each consisting of 35 (Collegiate, V, and JV), 30 (MS), or 25 (Elementary) tossup questions.

The 2022 International History Olympiad’s military history topic will be Aerospace History. This will include both military and civil aviation history and the history of human activity in outer space in all its forms.

2018 Champions (Topic was German Military History)
Varsity: Boyang Hou, Singapore
Junior Varsity: Govind Prabhakar, India
Middle School: Shiva Oswal, California

2016 Champions (Topic was Naval History)

Varsity: Boyang Hou, Singapore
Junior Varsity: Ryan Hamilton, Canada
Middle School: Shiva Oswal, California

2015 Champions (Topic was 20th Century Military History)
Varsity: Bruce Lou, California
Junior Varsity: Jonathan Tran, Oregon
Middle School: Chansol Park, Hong Kong