Stanley W. Merrell (December 26, 1876 – February 14, 1921) was a lawyer from a prominent Cincinnati family in the U.S. State of Ohio.

[1] William Stanley Merrell was the "first educated chemist to take up residence west of the Allegheny Mountains", discovered and introduced podophyllin, and his company was one of the largest pharmaceutical manufacturers of its time.

[3] He resigned when Governor James M. Cox appointed him a judge on the Cincinnati Superior Court on September 1, 1913.

[1][3] One month before the expiration of his term in Cincinnati, Merrell was appointed by Governor Cox to the Ohio Supreme Court on December 2, 1919, to a seat vacated by Maurice H. Donahue, who had been appointed to the United States Court of Appeals for the Sixth Circuit.

[3] He served only six months before resigning June 18, 1920, to accept the job of general counsel for the Big Four Railroad, with offices in Cincinnati.