Thomas Haynes Bayly (1797 - 1839) was a miscellaneous writer, son of a wealthy lawyer in Bath.

Originally intended for the law, he changed his mind and thought of entering the Church, but abandoned this idea also, and gave himself to writing for the stage and the periodical press. He is chiefly known for his songs, of which he wrote hundreds, which, set to the music of Bishop and other eminent composers, found universal acceptance. Some were set to his own music. He also wrote several novels and a number of farces, etc. Although making a large income from his writings, in addition to that of his wife, he fell into embarrassed circumstances. Among the best known of his songs are I'd be a Butterfly , Oh, no, we never mention Her , and She wore a Wreath of Roses . He may be regarded as, excepting Moore, the most popular song writer of his time.