Fabian Posch (born 5 January 1988) is an Austrian former handball player, who played for the Austrian national team.
Posch started his career at the youth team of UHC Salzburg. He started as a back player, and was reeducated as a pivot.
In 2006 he joined Bregenz Handball. Here he won the Austrian Championship four times. In the 2008-09 season he was named rookie of the season.
For the 2010-11 season he joined ULZ Schwaz.
For the 2013-14 eaon he joined the recently promoted SC Ferlach. Here he had his best season scoring wise with 137 goals, and that prompted a move to SG Handball West Wien in 2014.
After 2 years he joined UHK Krems. In the 2018-19 he won the cup and league double with Krems. The same season he was named as the player of the season.
In 2022 he joined Jags Vöslau. After the 2023-24 season he retired.
With the Austrian national team Posch played at the 2025 World Men's Handball Championship, where Austria reached the round of 16. Posch played 6 games and scored 14 goals.