Mitsui Engineering & Shipbuilding is a Japanese company. Mitsui E&S is one of the companies of the Mitsui Group.
Established in 1917 as the Shipbuilding Division of Mitsui & Co. with the first shipyard at Tamano. In 1937 the shipyards became a separate entity of Mitsui, Tama Shipyard.
The company changed to Mitsui Shipbuilding & Engineering Co., Ltd in 1942 and finally to the current name in 1973.
- Tamano Shipyard
- Chiba Shipyard
- Oita Factory
- Yura Dockyard (MES Yura Inc)
- Niigata Shipyard — acquired from Niigata Engineering Co. Ltd and renamed Niigata Shipbuilding & Repair, Inc. 2003