Morrison–Knudsen
| Company type | Private (1912–32) Public (1932–96) | 
|---|---|
| Industry | Construction Transport | 
| Founded | 1912 | 
| Founder | Harry Morrison Morris Knudsen | 
| Defunct | 1996 | 
| Fate | Declared bankruptcy in 1996, sold to Washington Construction Group, the brand then acquired by AECOM in 2014 | 
| Headquarters | , U.S. | 
| Area served | Worldwide | 
| Products | Diesel locomotives | 
| (1998) | |
| 1.86 billion | |
| Owner | Washington Construction Group (1996) | 
| Number of employees | 8,500 | 
| Divisions | MotivePower (1972–96) | 
Morrison–Knudsen (MK) was an American civil engineering and construction company, with headquarters in Boise, Idaho.
MK designed and constructed major infrastructure throughout the world and was one of the consortium of firms that built Hoover Dam, San Francisco–Oakland Bay Bridge, the Trans-Alaska Pipeline, and many other large projects of American infrastructure.