"Mon Dieu" (my God in French) is a 1960 song by Édith Piaf. The lyrics are by Michel Vaucaire and the music is by Charles Dumont. Édith Piaf sang this song originally in French, but recorded it in English as well. The song has been sung by many other singers, such as Mireille Mathieu, too.
Elaine Paige covered the song on her 1994 album Piaf.
References
Mon Dieu Wikipedia(Text) CC BY-SA