Caroline Unger (sometimes "Ungher") (October 28, 1803 – March 23, 1877) was an Austro-Hungarian contralto.
Born in Vienna, she studied in Italy; among her teachers were Aloysia Weber Lange and Domenico Ronconi. Her stage debut, in her native city, came in 1821, when she performed in Mozart's Così fan tutte, a performance for which Franz Schubert had briefly served as her repetiteur. Three years later she sang in the first performances of Ludwig van Beethoven's Ninth Symphony and Missa Solemnis. She performed a great deal in Italy; among the operas written for her were Vincenzo Bellini's La straniera (1829, Milan), Gaetano Donizetti's Parisina (1833, Florence), Belisario (1836, Venice), Maria de Rudenz (1838, Venice), and Saverio Mercadante's Le due illustre rivali (1838, Venice). Unger had a great success at the Théâtre-Italien in Paris in 1833. In 1841 she married François Sabatier and retired from the stage.
She is memorable for her part in the famous anecdote regarding the applause at the premiere of Beethoven's Ninth Symphony – it was reportedly she who turned the completely deaf composer around to receive his audience's thunderous applause.
Unger died in Florence in 1877.