John Haskell Hewitt (August 8, 1835 – October 8, 1920) was an American classical scholar and educator, notable for serving as acting president of Williams College from 1901 to 1902.

He served as a librarian at Yale's Brothers in Unity Library until 1865,[3] until he accepted a position teaching Latin and Greek at Olivet College.

[2] In 1875 Hewitt moved to Lake Forest College in Illinois, due to health problems, and served as trustee and acting president there.

In 1882, Franklin Carter, now president of Williams College in Massachusetts, contacted Hewitt and offered him a prestigious professorship in ancient languages.

[2] When Carter resigned in 1901, Hewitt was named acting president until 1902, when he was replaced by Henry Hopkins.