Padang Rengas (Jawi: ڤادڠ رڠاس; Chinese: 硝山) is a small town in Kuala Kangsar District, Perak, Malaysia.
It has a police station, railway station, rural health centre, market and Schools ~ SJK(C) Khiu Min, SK Tun Dr. Ismail, SK Perempuan & SMK Tun Perak, including a Technical-based education school. Padang Rengas has a major cement manufacturing complex and surrounded by rubber estates.
A site of interest is Gunung Pondok, a large limestone hill that is being actively quarried by YTL.