Kozai

Kozai may refer to:


 * Kozai-Lidov mechanism, a dynamical phenomenon in celestial mechanics
 * 3040 Kozai, an asteroid

Persons with the surname Kozai

 * Yoshihide Kozai (1928–2018), Japanese astronomer
 * Kazuteru Kozai (born 1986), Japanese badminton player
 * Kaori Kozai (born 1963), Japanese singer
 * Takeshi Kozai (1974–2006), Japanese judoka