"Mercy" is a song by Canadian singer and songwriter Shawn Mendes. It was co-written by Mendes with Ilsey Juber, Danny Parker, Robin Weisse and Teddy Geiger, with the latter handling the song's production with Jake Gosling. It was released on August 18, 2016, through Island Records as the third promotional single, and later as the second single on October 18, 2016, from his second studio album, Illuminate (2016).