Triam Udom Suksa Pattanakarn School (Thai: โรงเรียนเตรียมอุดมศึกษาพัฒนาการ, commonly abbreviated as Triampat, is a high school located in Bangkok, Thailand.

It admits lower-secondary and upper-secondary students (mathayom 1–6, equivalent to grades 7–12).

Founded in 1978 as a campus school of Triam Udom Suksa School, Bangkok, Thailand which is preparatory school for Chulalongkorn University.

Triam Udom Suksa Pattanakarn School has among the top 3 highest university entry rates for Thai high-schools, and its students consistently score among the top in national standardized tests.

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