Assumption College is a Roman Catholic all-boys private school in Bangkok, Thailand. The school was founded by Father Emile-August Colombet on 16 February 1885, and is the first school founded by the Order of Brothers of Christian Instruction of St Gabriel. Assumption College is the third-oldest boys school in the country.

Suankularb Wittayalai School literally Rose Garden College is an all-boys secondary school for grades 7 through 12 in Bangkok, Thailand. Founded by King Chulalongkorn in 1882 as a peer's school, its purpose was to educate the children of nobility and the royal household. Suankularb is the oldest public secondary school in the country. Suankularb alumni include eight Prime Ministers of Thailand, nine Supreme Court Chief Justices, five attorneys general, two Fortune Global 500 chief executives, scholars, as well as a number of prominent politicians and businessmen. Suankularb is a member of Jaturamitr group of the four oldest boys' schools in Thailand. Suankularb consists of 11 campuses all over Thailand.