The 2004 No Mercy was the seventh No Mercy professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was held exclusively for wrestlers from the promotion's SmackDown! brand division. The event took place on October 3, 2004, at the Continental Airlines Arena in East Rutherford, New Jersey. Eight professional wrestling matches were contested on the event's card.

Many types of wrestling matches, sometimes called "concept" or "gimmick matches" in the jargon of the business, are performed in professional wrestling. Some gimmick matches are more common than others and are often used to advance or conclude a storyline. Throughout professional wrestling's decades-long history, some gimmick matches have spawned many variations of the core concept.