Thirsty Merc is an Australian rock band formed in 2002 in Sydney, Australia. The band consists of Rai Thistlethwayte (vocals/guitar/keyboards), Phil Stack (bass guitar), Karl Robertson (drums), and Matt Smith (guitarist).

Thirsty Merc have released one EP entitled First Work, and 3 studio albums; Thirsty Merc, Slideshows, and Mousetrap Heart. The band has sold over 200,000 albums, has toured extensively around Australia, and have received heavy airplay in Australia on an impressive number of songs.