The Carltheater was a theatre in Vienna. It was in the suburbs in Leopoldstadt at Praterstraße 31 (at that time called Jägerzeile). It was the successor to the Leopoldstädter Theater. After a series of financial difficulties, that theater had been sold in 1838 to the director, Carl Carl, who continued to run it in parallel to his Theater an der Wien until 1845. Two years later, the building was partially demolished and rebuilt following the plans of architects August Sicard von Sicardsburg and Eduard van der Nüll, who would later design the Vienna State Opera.