SMKA Tun Hajah Rahah or Tun Hajah Rahah Religious National Secondary School (; ;) is a Malaysia educational institution established in 1982. The institution is located at town Simpang Lima, Sungai Besar in the District of Sabak Bernam, Selangor, Malaysia.
In 1979, the Ministry of Education under the Division of Technical and Vocational and the Selangor State Education Department were planning to build a vocational school for agriculture in Selangor. The development was financed by a special facilities loan for education development from the World Bank. An area of at an agricultural village in Simpang Lima was chosen as the site for construction. The site selection was based on the factors that the land was an undeveloped state-owned land.
The school was named Simpang Lima after a penta-junction at Jalan Kuala Selangor Lama near Sungai Nibong village. The construction completed in 1982 and the school was finally opened for admission in January 1982. However, due to political and public pressure, it was established as SMK Simpang Lima, a public secondary school and not as a vocational school as per planned.
After six years of service, there was a move by the school's Parent-Teacher Association with recommendation from the District Education Office of Sabak Bernam, to elevate the school status into a religious boarding school.
This proposal was accepted by the Ministry of Education and the Selangor Education Department. In 1988, the school's name was officially changed from SMK Simpang Lima to SMKA Simpang Lima.
In 2015, the school was rebranded as SMKA Sabak Bernam to represent the whole district of Sabak Bernam.
In 2016, the school was rebranded as SMKA Tun Rahah
At its opening, the school was made up of 1 double-storey block for administration, 3 double-storey blocks for classrooms, 1 single-storey block for laboratories and workshop, 8 medium quarters for teachers and school staff, and a canteen. When the school gradually evolved into a boarding school, one of the classroom blocks was converted into a hostel.
In 1992, the school received 4 new three-storey hostel block and a dining hall. In the same year, with the effort from the PTA and the local communities, a new surau was built.
In 1998, under the Sixth Malaysia Plan (RMK6), the Ministry of Education approved another construction of one three-storey classroom block and two three-storey hostel blocks, a new dining hall for female students, a water tank and two new playing court.
In 2002, the school received a new Multipurpose Hall and a new shuttle bus.
In 2004, the new one storey Computer Laboratories block completed.
In 2008, the school received a Class C Quarters for Headmaster residence and a new block next to the Multipurpose Hall.