Leroy Branch Valliant (June 14, 1838 – March 3, 1913) was an American attorney and judge.

[1][6][2] During the Civil War, he enlisted in the Confederate States Army and was a captain of Company I, 22nd Mississippi Regiment.

[1][2][3] He was authorized to practice in the United States District Court of Missouri in January 1875.

[8] In 1884, Valliant had an unsuccessful run for the St. Louis Court of Appeals as a Democrat.

[9][10] In October 1886, he was selected to fill a vacancy on the Democratic ticket for the St. Louis Circuit Court.

[11] However, on November 4, 1886, Governor John S. Marmaduke appointed Valliant to the circuit court fill the unexpired term of the deceased Judge Horner.

[1][2][3] He was reelected to the Supreme Court for a ten-year term in 1902, serving as its chief justice.

[4] Valliant died from a bronchial condition on March 3, 1913 in Greenville at the age of 75 years.

[13] On August 10, 1913, the Supreme Court of Missouri held a memorial service for Valliant and accepted the presentation of his portrait by artist Mariano Hernandez Arevalo.