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.
She resumed her career in Denmark in 1850, where she had a moderately successful career at the Kasinoteatern and Folketheatret until her retirement in 1884.