Johann Georg Reinhardt (c. 1676 – 6 January 1742) was an Austrian composer. (His name is sometimes spelt Rheinhardt, Reinhard, or Reinharth.) Appointed imperial court organist on 1 January 1708, he later became later Kapellmeister of St. Stephen's Cathedral, Vienna. One of his students was Giuseppe Bonno. He composed ballets, serenatas, one opera and some church music.