The Malaysian Expressway System (Malay: Sistem Lebuh Raya Ekspres Malaysia) is a network of national controlled-access expressways in Malaysia that forms the primary backbone network of Malaysian national highways. The network began with opening of the Tanjung Malim–Slim River tolled road (part of Federal Route 1) which was opened to traffic on 16 March 1966, followed by the construction of the North–South Expressway (NSE). The system continues to be substantially developed. Malaysian toll road-expressways are built by private companies under the supervision of the government highway authority, Malaysian Highway Authority (abbreviated as MHA; also referred to as Lembaga Lebuhraya Malaysia (LLM) in Malay). While toll-free expressways are built by Malaysian Public Works Department or Jabatan Kerja Raya Malaysia (JKR) in Malay.

The expressway network of Malaysia is considered as one of the best controlled-access expressway network in Asia and in the world after Japan and South Korea. With total length over 5,027 kilometres (3,124 mi), of which 2,996 kilometres (1,862 mi) are toll-free expressways and 2,031 kilometres (1,262 mi) are toll-expressways. All Malaysian toll expressways are controlled-access highway and managed in the Build-Operate-Transfer (BOT) system.

There are expressways in West Malaysia and East Malaysia, however, the former are better-connected. The North–South Expressway passes through all the major cities and conurbations in West Malaysia, such as Penang, Ipoh, the Klang Valley and Johor Bahru. The Pan Borneo Highway is the longest toll-free expressways in Malaysia, connects the Malaysian states of Sabah and Sarawak with Brunei.

A few major expressways in Malaysia are part of the larger Asian Highway Network. The Asian Highway Network is an international project between Asian nations to develop their highway systems, which will form main routes in the network. Seven Asian Highway routes pass through Malaysia:

The status of the route alignment of the Asian Highway 2 crossing the Malaysia–Singapore border is in dispute. Malaysia had commissioned the Second Link Expressway E3 as part of AH2 to maintain the primary access-controlled highway status of the route. Meanwhile, Singapore had commissioned the Johor–Singapore Causeway and the Bukit Timah Expressway as part of AH2, as the Johor–Singapore Causeway is the main gateway to Singapore from Malaysia, which could mean that the Skudai Highway would be included in the route alignment instead of the Second Link Expressway.

The completion of Johor Bahru Eastern Dispersal Link Expressway (EDL) in 2012, the Asian Highway AH2 route were re-routed to Eastern Dispersal Link Expressway (EDL) from Second Link Expressway. Second Link Expressway were gazetted as a part of Asian Highway AH143.

The Second Link Expressway, the Ayer Rajah Expressway, Marina Coastal Expressway and Kallang–Paya Lebar Expressway were later gazetted as Asian Highway AH143.

Before tolled expressways were introduced in the mid-1970s, most Malaysians travelled around Peninsula Malaysia on federal roads.