LeBaron B. Colt (1846 - 1924) was a United States Senator from Rhode Island and a circuit court judge. He was born on June 25, 1846 in Dedham, Massachusetts. He attended the public schools and Williston Seminary. He received an A.B. from Yale University in 1868 and an LL.B. from the law department of Columbia College in 1870.
After getting his law degree, Colt devoted a year to European travel. Once he returned, he was admitted to the bar and commenced practicing law in Chicago. In 1875, he moved to Bristol, Rhode Island, and started practicing law in Providence.
From 1879 to 1881, Colt was a member of the Rhode Island House of Representatives.
On March 9, 1881, President James A. Garfield nominated Colt to the U.S. District Court for the District of Rhode Island. The Senate confirmed him on March 21. Three years later, Colt was elevated to the United States Court of Appeals for the First Circuit, with President Chester A. Arthur nominating him on July 2, 1884 and Senate confirmation on July 5. On June 15, 1891, Colt was reassigned to the United States Court of Appeals for the First Circuit by the Judiciary Act of 1891.
In 1913, Colt was elected as a Republican to the United States Senate by the Rhode Island legislature. On February 7, he resigned from the appellate court, and on March 4, he was sworn in as Senator.
From 1917 to 1919, Colt was chairman of the Committee on Conservation of Natural Resources. From 1919 until his death, he was chairman of the Committee on Immigration.
Colt died on August 18, 1924 in Bristol. He was buried in Juniper Hill Cemetery.