The 9th World Science Fiction Convention (Worldcon), also known as Nolacon I, was held 1–3 September 1951 at the St. Charles Hotel in New Orleans, Louisiana, United States.

Smith, L. Sprague de Camp, editor John W. Campbell and fantasy artist Hannes Bok, who did Nolacon's program book cover.

The latter, editor of the very popular fanzine Quandry, whom everyone assumed was male, turned out to be a young woman, a ‘revelation’ which greatly startled even those who had corresponded with her.

Mike Glyer's long-running newszine File 770, named in commemoration of this party, has won the Hugo Award for Best Fanzine a number of times.

[1] A "Certificate of Merit" was presented to representatives of The Day the Earth Stood Still by the Nolacon I chairman, and this was reported on Movietone News at the time.