Ngee Ann Secondary School (abbreviation: NASS) is an autonomous government-aided secondary school in Tampines, Singapore. Founded in 1994 by the Ngee Ann Kongsi, a Teochew clan foundation, Ngee Ann Secondary was 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.