Burton Kendall Wheeler (February 27, 1882 – January 6, 1975) was an attorney and an American politician of the Democratic Party in Montana, which he represented as a United States senator from 1923 until 1947.

Born in Massachusetts, Wheeler began practicing law in Montana almost by chance, after losing his belongings while en route to Seattle. As the U.S. Attorney for Montana, he became known for his criticism of the Sedition Act of 1918 and defense of civil liberties during World War I. An independent Democrat who initially represented the progressive wing of the party, he received support from Montana's labor unions in his election to the Senate in 1922.

As a freshman senator, Wheeler played a crucial role in exposing the Harding administration's unwillingness to prosecute people involved in the Teapot Dome scandal. He ran for vice president in 1924 on the Progressive Party ticket headed by Wisconsin Senator Robert La Follette Sr. An ardent New Deal liberal until 1937, Wheeler broke with President Franklin D. Roosevelt on the issue of packing the Supreme Court. In foreign policy, from 1938 to 1941, he became a leader of the non-interventionist wing of the party, fighting against entry into World War II until the attack on Pearl Harbor.

Wheeler lost reelection in 1946 and retired to private practice in Washington, D.C.

Wheeler was born in Hudson, Massachusetts, to Mary Elizabeth Rice (née Tyler) and Asa Leonard Wheeler. He grew up in Massachusetts, attending the public schools. He first worked as a stenographer in Boston.

He traveled west to attend University of Michigan Law School, where he graduated in 1905. He initially intended to settle in Seattle, but after getting off the train in Butte, Montana, he lost his belongings in a poker game. The new attorney settled there and began practicing law.

Wheeler was elected as a Montana state legislator in 1910, and in that position, he gained a reputation as a champion of labor against the Anaconda Copper Mining Company that dominated the state's economy and politics. He was appointed as a United States Attorney. During his tenure, he refused to prosecute alleged sedition cases during World War I, arguing that to do so would violate free speech. His refusal is significant as Montana was a stronghold of the Industrial Workers of the World. In other parts of the country, IWW membership was suppressed under the Sedition Act. Wheeler's defense of free speech was seen as unpatriotic if not treasonous by conservatives. He further riled conservatives when he served as defense attorney for William F. Dunne, a socialist newspaper editor who was accused of sedition. Wheeler's actions made him unpopular in the pro–World War I political climate, and he was forced to resign his office as a U.S. attorney in October 1918.

In 1920, Wheeler ran for Governor of Montana, easily winning the Democratic primary, and he won the support of the Non-Partisan League in the general election. The ticket included a multi-racial set of candidates, unusual for 1920, including an African American and a Blackfoot Indian. Wheeler was defeated by Republican former U.S. Senator Joseph M. Dixon.