Constantin Simon Reiner (born 11 July 1997) is an Austrian professional footballer who plays as a centre-back for China League One side Changchun Yatai.
For the 2023âÂÂ24 season, Reiner joined Rheindorf Altach on loan with an option to buy.
On 18 February 2025, Reiner moved to Chinese second division club Shaanxi Union.