Thomas Piermayr (born 2 August 1989) is an Austrian footballer who plays for SC Bad Sauerbrunn.
Piermayr started his career in 2008 with LASK Linz, for whom he played 78 games as a defender. He then signed for a one-year deal with Inverness in July 2011, after impressing manager Terry Butcher during the preseason. He left Inverness at the end of the season and signed for Wiener Neustadt. On 9 July 2013 he signed a contract with Lillestrøm out the season.
He has also represented the Austria national under-21 football team.