Sekolah Menengah Sains Tuanku Munawir (English: Tuanku Munawir Science School; abbreviated SASER; formerly known as Sekolah Menengah Sains Seremban), is an all-boys[1] boarding school located in Seremban, Negeri Sembilan, Malaysia.

SASER also created a record in producing the highest number of candidates obtaining straight A+ in SPM 2010 with 16 students.

The school uses the site of Sekolah Datuk Abdul Razak (SDAR) which had moved to the new premises at Sungai Gadut, Seremban.

On 1 March 2002, the first principal of SASER, Tuan Haji Md Azam bin Atan registered to the school.

The declaration of the new name was made by HRH Tuanku Muhriz at the school's Dewan Putera.