Assumption College (), is a private Catholic school for boys in Thailand. It was founded in 1885 by Father Emile August Colombet, and is the third-oldest school in Thailand. Assumption College is in Bang Rak, Bangkok. The school is one of the four schools in Jaturamitr Samakkee, a traditional football match by four oldest boys' schools in Thailand including Suankularb Wittayalai School, Debsirin School and Bangkok Christian College.