Frederic G. Ranken was an American librettist, lyricist, and playwright for light operas and musicals staged on Broadway from 1899 through 1907. His greatest success was the libretto for Reginald De Koven's 1905 comic opera Happyland. He also wrote libretti for composers Victor Herbert and Ludwig Engländer, and was a lyricist for composers Alfred Baldwin Sloane and Gustave Kerker among others. As a playwright he wrote the books for several musicals.