Tobias Bayer (born 17 November 1999) is an Austrian racing cyclist, who currently rides for UCI ProTeam Alpecin–Deceuninck. He rode for Tirol Cycling Team in the men's team time trial event at the 2018 UCI Road World Championships.
Bayer rode his first Grand Tour, Vuelta a España in 2021 and supported his captain and sprinter Jasper Phillipsen in two stage victories. In 2021 he became Austrian national champion in the U23 category (in road race and time trials).