Kolej Tuanku Ja'afar (KTJ) is a co-educational international school in Mantin, Seremban District, Negeri Sembilan, Malaysia, founded in 1991. Its primary school is a day school for pupils between the ages of 4 and 11, while its secondary school offers boarding for students from the age of 11 to 19. Day schooling is also possible in the secondary school. It is a British curriculum school.[8]