Casanova's Big Night is a 1954 American comedy film starring Bob Hope and Joan Fontaine, which is a spoof of swashbuckling historical adventure films. It was directed by Norman Z. McLeod.

Hope plays a tailor who impersonates Giacomo Casanova, the great lover. The film also stars Audrey Dalton, Basil Rathbone, Hugh Marlowe, John Carradine, Hope Emerson, Lon Chaney Jr., Raymond Burr, Natalie Schafer, and Vincent Price (in a cameo appearance as the real Casanova).