"Thirty-Nine" is a song by the British rock band Queen, featured on their 1975 album A Night at the Opera. Written by guitarist Brian May, the song tells a poignant story about longing and loss, using a folk-inspired melody and harmonies. The track showcases May's signature guitar work and emotional lyrics, reflecting themes of nostalgia and the passage of time. It stands out for its acoustic arrangement and is often appreciated for its storytelling quality, making it a memorable part of Queen's diverse discography.