"Say It Isn't So" is a song by the American rock band Hall & Oates, released in 1978. It features a blend of pop and rock elements, showcasing the duo's signature harmonies and catchy melodies. The lyrics express feelings of heartbreak and disbelief over a romantic relationship's end. The song was part of the album Along the Red Ledge and became a hit, reaching the top of the charts. Its emotional themes resonate with listeners, making it a memorable track in Hall & Oates' discography. The song remains popular in various media and continues to be celebrated for its relatable message.