Assumption College (Thai: โรงเรียนอัสสัมชัญ), 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.
The list of graduates includes four former Prime Ministers of Thailand, several businessmen, nine privy counselors, etc. A lot of students are Chinese Thais and the first student of school name Mr. Siew Meng Tek is also Chinese-Thai. Assumption College is the one of most famous schools in Thailand. As of today, more than 50,000 students have been educated at Assumption College.