St. Thomas' Secondary School (Malay: Sekolah Menengah Kebangsaan St. Thomas) is an all-boys secondary day school (girls admitted in Form 6) situated in Kuching, the capital of the Malaysian state of Sarawak.

It is the oldest school in Sarawak, though the school was originally at St Mary's location[clarification needed] back in 1848.

The school is the fourth oldest in Malaysia.

The students of St. Thomas are called Thomians regardless of gender, and it is a government-aided mission school.

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