2018 AFLW Premiership Tiarna Ernst (born 24 January 1988) is a former Australian rules footballer who played for the Western Bulldogs and Gold Coast in the AFL Women's competition.

Ernst was born on Thursday Island[1] in the Torres Strait region of Queensland and spent the majority of her childhood in Bamaga in the Cape York Peninsula.

She competed in athletics events as a youth and was only introduced to Australian rules football while attending James Cook University in Cairns when she was convinced to play in the local football league for the Manunda Hawks.

She made her debut in the thirty-two point win against Fremantle at VU Whitten Oval in the opening round of the 2017 season.

[8] Ernst announced her retirement in October 2020, stating that she was unable to successfully juggle both football and her medical career.