Peter William Ham (27 April 1947 – 24 April 1975) was a Welsh singer, songwriter and guitarist, best known as a lead vocalist and composer of the 1970s rock band Badfinger, whose hit songs include "No Matter What", "Day After Day" and "Baby Blue". He also co-wrote the ballad "Without You", a worldwide number-one hit for Harry Nilsson that has become a standard covered by hundreds of artists. Ham was granted two Ivor Novello Awards related to the song in 1973.

Ham committed suicide in 1975, when he became depressed while embroiled in band-related issues, such as label and management problems, as well as a lack of funds