Antonio Maria Nicolao Beduzzi (1675–1735) was an Austrian-Italian theater engineer, painter, and architect who flourished in Vienna at the turn of the 17th century.
He was born in Bologna in 1675. He succeeded Burnacini as the theatre architect at the Court in Vienna in 1708. Among his better known designs are:
- The interior of Melk Abbey for Jakob Prandtauer's baroque reconstruction
- St. Leopold's Church on Leopoldsberg above Klosterneuburg, near Vienna
- The cathedral museum of Passau
- Vienna's Theater am Kärntnertor (the site now occupied by Hotel Sacher)
- The frescos of the Landhaussaal in the Viennese Palais Niederösterreich
Beduzzi died in Vienna in 1735.