軍事心理學是研究、設計和應用心理學理論和經驗數據，以了解、預測和反擊友軍或敵軍或平民中可能不受歡迎、具有威脅或潛在危險的行為。

Military psychology is the research, design and application of psychological theories and empirical data towards understanding, predicting, and countering behaviours either in friendly or enemy forces or civilian population that may be undesirable, threatening or potentially dangerous.