Transjakarta or Jakarta BRT is a bus rapid transit (BRT) system in Jakarta, Indonesia. The first BRT system in Southeast Asia, it commenced operations on 15 January 2004 to provide a fast public transport system to help reduce rush hour traffic. The system is considered as the first revolutionary public transit mode in the capital city of Indonesia. The buses run in dedicated lanes (busways), and ticket prices are subsidised by the regional government. Transjakarta has the world's longest BRT system, which operates about 4,300 buses. Transjakarta aims to have 50 percent of its fleet be electric buses by 2027. By 2030, the aim is for the entire Transjakarta ecosystem to use electric buses. As of November 2023, it serves an average of 1.134 million passengers daily.

Bus rapid transit (BRT), also referred to as a busway or transitway, is a bus-based public transport system designed to have much more capacity, reliability and other quality features than a conventional bus system. Typically, a BRT system includes roadways that are dedicated to buses, and gives priority to buses at intersections where buses may interact with other traffic; alongside design features to reduce delays caused by passengers boarding or leaving buses, or paying fares. BRT aims to combine the capacity and speed of a light rail transit (LRT) or mass rapid transit (MRT) system with the flexibility, lower cost and simplicity of a bus system.