The 10th World Science Fiction Convention, or the tenth instance of Worldcon, was held on the Labor Day weekend, 30 August – 1 September 1952, at the Morrison Hotel in Chicago, and was chaired by Julian May.

The phrases "Tenth Anniversary World Science Fiction Convention" (TAWSFiC) and "Tenth Anniversary Science Fiction Convention" (TASFiC, likely a simple linotype error, as "World" is missing) were each used in some of this Worldcon's pre-convention materials; the phrase's acronyms "TAWSFiC" and "TASFiC" were never officially used in print or otherwise by the Chicago committee at that time.

The previous convention, Nolacon, is a plot point in The Case of the Little Green Men, the first novel by Mack Reynolds, which is set in part at "AnnCon", a fictional version of the 10th World Science Fiction Convention held in 1952.

[2] The real 10th Worldcon, held in Chicago, had no actual name like "AnnCon", being simply called, in its own publications, "the 10th Annual World Science Fiction Convention" (and once as "the 10th Annual Science Fiction Convention," likely a dropped-word linotype operator's typo).

Before and during the convention, its attendees often referred to it as "Chicon II," an unofficial nickname that stuck to this Chicago Worldcon in the decades that followed.