"I Go to Pieces" is a song written by Del Shannon which became a top ten hit for Peter and Gordon on 20 February 1965. The duo's fourth single, it was their first not to be written by John Lennon and Paul McCartney.

Peter and Gordon were a British pop duo, composed of Peter Asher and Gordon Waller (1945–2009), who achieved international fame in 1964 with their first single, the million-selling single "A World Without Love". The duo had several subsequent hits in America in the British Invasion era including "I Go to Pieces", "Lady Godiva", "Woman", "True Love Ways" and "Nobody I Know".