Kieran John Callinan (born 21 January 1986), known by his stage name Kirin J. Callinan, is an Australian singer, songwriter, and guitarist. He is also a founding member of Mercy Arms and has played with the Night Game and Jack Ladder and the Dreamlanders. Callinan has collaborated with a wide range of musicians, including Mark Ronson, Jimmy Barnes, James Chance, Alex Cameron, Connan Mockasin, and brothers Neil and Tim Finn. Barnes and Cameron feature in Callinan's 2017 single "Big Enough". Barnes' distinctive screaming cameo became an internet meme.