Miriam-Stefanie Kastlunger (born 2 March 1994, Innsbruck) is an Austrian luger.
She represented Austria at the 2014 Winter Olympics in Sochi in women's and team relay competitions.
[1] In the women's singles, she finished 17th.
In the team relay, together with Wolfgang Kindl (men's single) and Andreas Linger / Wolfgang Linger (double), she became 7th.
[2] Kastlunger was both women's and team relay champion in luge at the 2012 Winter Youth Olympics which took place in Innsbruck.