"Bernardine", often misspelled "Bernadine," is a 1957 song that was written by Johnny Mercer. (The prolific Mercer generally wrote lyrics for other composers, but for this song he was both composer and lyricist.) The best-known version is by Pat Boone, who had a #1 hit with it on the Billboard Best sellers in stores chart for one week beginning June 10, 1957. The song is performed by Boone in the movie of the same name.