Peter William Ham (27 April 1947 – 24 April 1975) was a Welsh singer, songwriter and guitarist, best known as a lead vocalist of and composer for 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 died of suicide in 1975 at the age of 27, when he became depressed while embroiled in band-related issues, such as label and management problems, as well as a lack of funds. The emotional scar his death left on Badfinger eventually led to the suicide of former bandmate Tom Evans in 1983.