"Mystic Eyes" is a song written by Northern Irish singer-songwriter Van Morrison when he was leader of the band Them.

In 1965, Van Morrison explained to a Belfast reporter how the song had just happened during the first recording session for the album and the band was just "busking" around.

Later in 1966 he told an American reporter how it was inspired by an occasion in Nottingham Park as he walked by a graveyard wall where some children played next to it.

"[2] Tommy Scott who was acting producer of Them sessions after Bert Berns returned to America described how "Mystic Eyes" came about in the studio as being originally conceived as an instrumental: "After blowing his harmonica for about seven minutes, Van suddenly burst into this spontaneous lyric."

Billboard said of the song that "with a hard driving Bo Diddley beat and a far-out lyric, this group has a hot winner here.

This was one of the songs included on the compilation album, The Story of Them Featuring Van Morrison released in 1997 on the Deram Records label.