The Subic–Clark–Tarlac Expressway (SCTEX), signed as E1 and E4 of the Philippine expressway network, is a controlled-access toll expressway in the Central Luzon region of the Philippines. From its northern terminus in Tarlac City to its southern terminus at Tipo in Hermosa, Bataan, the SCTEX serves as one of the main expressways in Luzon. The expressway is also connected to the Central Luzon Link Expressway, North Luzon Expressway, Tarlac–Pangasinan–La Union Expressway, and the Subic Freeport Expressway. The SCTEX is the country's longest expressway at 93.77 kilometers (58.27 mi) until the completion of Toll Road 4 of South Luzon Expressway (SLEX). The Subic–Clark–Tarlac Expressway was constructed to provide a more efficient transport corridor between Subic Bay Freeport, Clark, and the Central Techno Park in Tarlac, foster development on the municipalities served, and connect major infrastructures such as the Subic Seaport and Clark International Airport.

The Philippine expressway network, also known as the High Standard Highway Network, is a controlled-access highway network managed by the Department of Public Works and Highways (DPWH) which consists of all expressways and regional high standard highways in the Philippines.