bianca.com, informally known as Bianca's Smut Shack, was an online community created on February 14, 1994, by a group of dot-com software developers. Originally based in Chicago, the group later moved to San Francisco and included David Thau and Chris Form Miller. bianca was one of the web's first 500 content creations and was the world's first web-based chat room. It later also became a popular theme camp at Burning Man.

The site has long been infamous for its extreme free speech and raucous discourse and its sociological effect on the Internet and elsewhere has been extensively detailed in a thesis by "Freeform" (Miller), who studies bianca-style chat rooms as a sort of petri dish for incubating deviant behavior.

In 1997, Radio Shack sought to prevent bianca's "Smut Shack" from using that name, citing their previous use of the word "shack" and claiming exclusive use. They later backed down from their legal action.

In 1999, the site was purchased by Nerve.com, but by 2001 they had given up on the venture due to excessive bandwidth costs. Nerve announced bianca's impending closure, though they vowed to find a way to preserve at least part of the site.