Sekolah Menengah Kebangsaan St Patrick is the oldest mission school in Kulim, Kedah. It was founded on 1 August, 1933. At the very beginning, there were only eleven pupils. As the student intake grew, it became necessary for the school to expand. The present school complex sits on a 1.6-hectare site that was donated by local philanthropist Tan Ah Choy. Today the majority of the students are from the Indian community.