L’occasione fa il ladro, ossia Il cambio della valigia is an opera in one act by Gioachino Rossini to an Italian libretto by Luigi Prividali, based on Le prétendu par hasard, ou L’occasion fait le larron, an 1810 vaudeville by Eugène Scribe.

The Teatro San Moisè was a theatre and opera house in Venice, active from 1620 to 1818. It was in a prominent location near the Palazzo Giustinian and the church of San Moisè at the entrance to the Grand Canal.