Frederick Smyth (1832 in Galway, Ireland – August 18, 1900 in Atlantic City, New Jersey) was an American lawyer and politician from New York.
Smyth was a delegate to the 1876 Democratic National Convention, and later the same year was a presidential elector casting his vote for Samuel J. Tilden and Thomas A. Hendricks.
In November 1878, Smyth ran on the Tammany ticket for New York County District Attorney but was defeated by the Republican incumbent Benjamin K. Phelps.
In November 1879, Smyth ran on the Tammany ticket for Judge of the Court of Common Pleas, but was defeated by Miles Beach.
Smyth lived at 15 West Forty-sixth Str., but died from pneumonia during an extended summer vacation at the Hotel Dennis in Atlantic City.