The Shaoshan 3B (Chinese: 韶山3B/大3B[2]) is a type of electric locomotive used on the People's Republic of China's national railway system.

This locomotive was built by the Ziyang Electric Locomotive Works.

The power supply was industrial-frequency single-phase AC, and the axle arrangement Co-Co+Co-Co. SS3B Electric Locomotive is a twelve shaft fixing reconnection heavy freight electric locomotive which based on two six-axle locomotives connected.

SS3Bs have been used by several users: SS3Bs have been manufactured by several companies: