Inez Fabbri (26 January 1831 – 30 August 1909), née Agnes Schmidt, was an Austrian American soprano, voice teacher and impresaria.

She sang in Austria, Germany, England, South America and the Caribbean, making her home in San Francisco where, in the 1870s, she was the most important musical personality and prima donna assoluta of her time, performing in more than 150 concerts and operas from 1872 to 1879, producing operas, and teaching voice to up-and-coming singers.

She made a successful operatic debut in Kassa, Hungary, (now Košice, Slovakia) in Donizetti's Lucrezia Borgia in 1847.

From May 1863 to March 1864, she sang thirty-seven performances at the Wiener Hofoper in roles which included Elvira and Leonore in Verdi's Ernani and Il Trovatore, Raquel in Halévy's La Juive, and Alice and Berthe in Meyerbeer's Robert le diable and Le Prophète.

[2][4] From 1864 to 1871 they lived in Frankfurt am Main where Fabbri was engaged to sing at the Stadttheater in roles which included Elisabeth in Wagner's Tannhäuser.

After large financial losses she lived in Los Angeles from 1891 but later returned to San Francisco where she again lost her assets in a fire believed to be arson.

[8] and her definitive original portrait is housed at the San Francisco Museum of Performing Arts and Design as donated by the Constance Jacoby Horstman and Janet Richmond Families.