Betzy "Betty" Christiane Smidth (5 March 1819 – 31 January 1892) was a Danish stage actress and opera soprano.
She is known to have been the opera primadonna of the Norwegian stage in the mid 19th-century.
She was from Denmark, and made her debut in Copenhagen in 1836.
She was engaged at the Christiania Theatre in Oslo in Norway in 1837-50, where she reportedly succeeded Augusta Schrumpf as the leading operatic star of the Norwegian stage.
She was particularly known for her ability as a soubrette, and among her more famed roles where Angela in Black Domino.