The altarpiece is a bronze statue of St. George, also a work from the 15th century, supposedly made by the court caster Maximilian I.
In the centre of the church is the reliquary of Frederick III, which was removed in 1770 because it took up too much space. In 1990, the reliquary was reinstalled in St. George's Cathedral after restoration.
In the rear part of the church is the dodecagonal baptismal font from Adneter Rotscheck, a work from the 15th century, which was probably used for the baptism of Maximilian I in 1459.
In addition to the tomb of Maximilian I., there is also a crypt in St. George's Church. At the front in the right aisle, the choir bishop of Cologne, Provost Wolfgang Georg, a brother of Empress Eleonore (wife of Leopold I) was buried in 1683. He had died here on the return journey from Rome. The cover plate of his tomb bears the inscription: "Tell me, dumb stone, whose bones you hold? Look around you and read the name in the ore on the right!"
As a cooperation partner of the Lower Austrian Provincial Exhibition 2019, the Military Academy is presenting the exhibition "From the Imperial Residence to the Officer's Forge". The life and work of Maximilian I. plays a central role in this exhibition. In order to make the tomb of Maximilian I. more accessible to visitors, the interior of the church was modified after a limited competition of five designs. The jury, in which the military bishop Werner Freistetter was also represented, chose the design by the Tyrolean artists Martin and Werner Feiersinger.