William Milnor Roberts (February 12, 1810 in Philadelphia, Pennsylvania – July 14, 1881 in Soledad, Brazil) was an American civil engineer.
Roberts was one of the most prolific and prominent civil engineer of his generation in the United States.
As a young civil engineer, he was involved in the construction of the Eads Bridge, held the title of the chief engineer of Northern Pacific Railroad, and was president of the American Society of Civil Engineers scarcely two decades after its founding,