Austin Peay IV (June 1, 1876–October 2, 1927) was governor of the U.S. state of Tennessee from 1923 until his death.

Peay was a native of Kentucky. He came to Clarksville, Tennessee and opened a law practice in 1896. He was first elected to the Tennessee House of Representatives in 1901 and re-elected in 1903. A strong supporter of public education, Peay obtained the Democratic nomination for governor in 1922 to oppose incumbent Republican governor Alf Taylor.

Peay defeated Taylor in the election of November 1922. Inaugurated as governor on January 16, 1923, Peay undertook a major reorganization of state government, partially to strengthen transportation. The Tennessee Department of Highways and Public Works (now Tennessee Department of Transportation) was established as part of Peay's reorganizational efforts. He was re_elected in 1924.

Peay was governor during the Scopes Monkey Trial. Given his emphasis on and support for education, it seems unlikely that he was pleased with the nature of the publicity that this event gave the state. (The state government had engaged William Jennings Bryan to defend the law and prosecute Scopes, however.) Peay was reelected to a third term in 1926. His health seemed to be declining, and many suggested that attempting to get the state legislature to fund his education plans properly (which was difficult in view of the limited tax base in the Tennessee of the 1920s) was taking a toll on him. When he died in late 1927 after having had a particularly protracted battle over school funding with the legislature in the spring of that year, many citizens, especially the more progressive ones, reacted almost as if the legislature had killed him.

No Tennessee governor had ever died in office before. (As of 2004, neither has any done so since.) There was a tremendous outpouring of grief, particularly in some parts of the state, where schools were dismissed, flags flown at half-mast, and people, especially governmental officials, dressed in even more black than was already typical for the time, and all of the traditional symbols of mourning were employed. Peay was succeeded under the terms of the Tennessee State Constitution by Speaker of the Senate Henry Hollis Horton. In honor of Peay's leadership in roadbuilding, a bridge over the Cumberland River in Jackson County (now demolished) was named in his honor the next year. A newly_acquired normal school in Clarksville (now Austin Peay State University) was named in his honor in 1929. Tennessee Highway 14 from Memphis to Brownsville is also named in his honor.