Sekolah Menengah Kebangsaan Bandar Tun Hussein Onn (or SMKBTHO), sometimes referred as SMK Bandar Tun Hussein Onn 2 (although there were never another school of the same name before it), is a secondary school in the state of Selangor, Malaysia. It is the only secondary school in the Bandar Tun Hussein Onn suburb. The school is located in the city of South Cheras, in the district of Hulu Langat and under the subdistrict of Balakong.