Once Upon a Time: A Floating Opera

{{Short description|1994 novel by John Barth}}

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{{Use mdy dates|date=March 2025}}

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Once Upon a Time: A Floating Opera is a novel by American writer John Barth, published in 1994. A character named John Barth and his female companion set sail on Chesapeake Bay on the 500th anniversary of Columbus's discovery of America and are unexpectedly caught in a tropical storm. While trying to find his way out of the Maryland marshes, Barth comes across a "metaphysical zone" in which he encounters scenes and characters from his previous novels. The title references Barth's first novel, The Floating Opera (1956).{{sfn|Lesher|2000|p=67–68}}