This tag denotes that the tagged work prominently features one or more sources that are heavily associated with the lost media community. Works with this tag should have their primary focus be on said sources. If the work is multisource, and only features these sources incidentally, the tag should not be used.

Lost Media is a term for any media that is known to exist, but a copy, in part or in its entirety, isn't viewable. Lost media became a popular subject online in the mid 2010s when YouTubers like blameitonjorge and LSuperSonicQ began to shed light on the hunts for specific media, boosting them greatly in popularity. Notable examples of media that are associated with the community include, but are not limited to, About Dressy Sally, Ulterior Motives, and Charlie, The Steak.