Rapid Bus Sdn Bhd is the largest bus operator in Malaysia operating mainly in urban areas of Klang Valley, Penang & Kuantan. As of February 2023, Rapid KL service brands unit of Rapid Bus, has operates 113 normal routes and also 69 MRT Feeder Bus routes, along with 8 Nadiputra routes in Putrajaya.

Rapid KL is a public transportation system owned by Prasarana Malaysia and operated by its subsidiaries Rapid Rail and Rapid Bus. The acronym stands for Rangkaian Pengangkutan Integrasi Deras Kuala Lumpur, which translates to Kuala Lumpur Rapid Integrated Transport Network in the Malay language. Rapid KL, with its 204.1 km (126.8 mi) of metro railway and 5.6 km (3.5 mi) of BRT carriageway, is part of the Klang Valley Integrated Transit System, operating throughout Kuala Lumpur and Selangor's satellite cities in the Klang Valley area.