"Thirty-Three" is a song by the American rock band The Smashing Pumpkins, featured on their 1995 album, Mellon Collie and the Infinite Sadness. The song is characterized by its soft melodies and introspective lyrics, exploring themes of longing and nostalgia. The track showcases the band's signature blend of alternative rock and dream pop, with a focus on emotional expression. Billy Corgan, the band's frontman, wrote the song, which has been praised for its haunting atmosphere and lyrical depth, making it a standout piece in their discography.