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.