Assumption College (Thai: โรงเรียนอัสสัมชัญ) is a private Catholic boys school in Bangkok, Thailand. The school, founded by Rev. Fr. Emile-August Colombet on 16 February 1885, is the first school founded by the Gabrielite Brothers in Thailand. Assumption College is the third-oldest boys school in Thailand.
The school provides education for students from years 2 through 13. Matriculation, especially in the first grade, is highly competitive. Assumption College has a long list of distinguished former pupils including four Prime Ministers of Thailand, 15 privy counselors, and three pupils among Thailand’s 10 Richest.
Assumption College is one of four schools which participates in Jaturamitr Samakkee, a traditional football match by the four oldest boys’ schools in Thailand: Suankularb Wittayalai School, Debsirin School, Bangkok Christian College and Assumption College.