Charles Nicholas Monsarrat (July 2, 1871 – March 1, 1940) was a Canadian-born bridge designer.
Monsarrat joined the Canadian Pacific Railway as a structural draftsman; in 1903, he became chief engineer of bridges.
Monsarrat served with the Royal Highlanders in France during World War I, becoming lieutenant-colonel in 1915.
From 1911 to 1918, he was president and chief engineer of the Quebec Bridge Board.
In 1921, he became a partner in a consulting company with Philip Louis Pratley.