Ngee Ann Secondary School (NASS) is a co-educational government-aided autonomous secondary school in Tampines, Singapore. Founded in 1994 by the Ngee Ann Kongsi, a Teochew clan foundation, Ngee Ann Secondary School is a successor to the now defunct Tuan Mong High School. The school offers secondary education leading to the Singapore-Cambridge GCE Ordinary Level or Singapore-Cambridge GCE Normal Level examination.