The Teatro San Benedetto was a theatre in Venice, particularly prominent in the operatic life of the city in the 18th and early 19th centuries. It saw the premieres of over 140 operas, including Rossini's L'italiana in Algeri, and was the theatre of choice for the presentation of opera seria until La Fenice was built in 1792.

The small, elegant theatre was first constructed by Michele Grimani on land owned by the Venier family. It was inaugurated on 26 December 1755 with a performance of Gioacchino Cocchi's opera Zoe. In 1766 the ownership of the San Benedetto passed from Grimani to a consortium of patrician families in Venice who had been box holders at the theatre. The original design of the theatre was circular. However it was rebuilt in the traditional horseshoe shape following a fire in 1773. In 1786 the owners' consortium had to cede the theatre to the Venier family following a lawsuit, and later went on to build La Fenice. The theatre then became the Teatro Venier (or Teatro Venier in San Benedetto). In 1810, the ownership passed to the impresario Giovanni Gallo, and for a time it was known as the Teatro Gallo. His sons, who had inherited the theatre in 1847, renamed it Teatro Rossini in 1868 in honour of Gioachino Rossini whose operas L'italiana in Algeri and Eduardo e Cristina had premiered there earlier in the century, but by then its glory days as an opera house were over.