Sekolah Menengah Sains Kuala Selangor (English: Kuala Selangor Science Secondary School; abbreviated KUSESS) is a Fully Residential School, also known as Sekolah Berasrama Penuh (SBP) in Malaysia. The school was built under the Sixth Malaysia Plan. The school is located in Bandar Melawati, Kuala Selangor which is about 70 kilometres from the nation's capital, Kuala Lumpur. Construction works on the school began on 24 April 1994 and were completed in 1996. Today the school has 783 students in 25 classes, taught by 75 teachers.