Thayer may refer to:
Places United States Thayer, Illinois Thayer, Indiana Thayer, Iowa Thayer, Kansas Thayer, Michigan Thayer, Missouri Thayer, Nebraska Thayer, West Virginia Thayer County, Nebraska Thayer Street, Providence, Rhode Island Thayer Township, Thurston County, Nebraska Mount Thayer, a mountain in the Santa Cruz Mountains of California
Education United States Thayer Academy in Braintree, Massachusetts Thayer Hall, a Harvard University dormitory Thayer Learning Center, Kidder, Missouri Thayer School of Engineering, Dartmouth College
Other Thayer (name), including a list of people with the name Thayer's gull Thayer Valve, a valve for trombones C.A. Thayer, a schooner preserved at the San Francisco Maritime National Historical Park.
See also Justice Thayer (disambiguation)