An all-seater stadium is a sports stadium in which every spectator has a seat. This is commonplace in professional association football stadiums in nations such as the United Kingdom, Spain, and the Netherlands. Most association football and American football stadiums in the United States and Canadian Football League stadiums in Canada are all-seaters, as are most baseball and track and field stadiums in those countries. A stadium that is not an all-seater has areas for attendees holding standing-room only tickets to stand and view the proceedings. Such standing areas are known as terraces in Britain. Stands with only terraces used to dominate the football attendance in the UK. For instance, the South Bank Stand behind the southern goal at Molineux Stadium, home of Wolverhampton Wanderers, had a maximum of 32,000 standing attenders, while the rest of the stadium hosted a little bit less than that; the total maximum attendance was around 59,000.

Some European countries, such as Germany, do not have all-seater stadiums. German fans expressed a preference to stand while watching football, so the country's grounds have large terraced areas. For instance, Borussia Dortmund's Westfalenstadion (commercially known as Signal Iduna Park) has an all-seated capacity of 65,829, but during Bundesliga games the attendance limit is set to 81,360. (If the general rule "two standing occupies the same space as one sitting" applies, then around 15,000 seats are replaced by 30,000 standing attenders at Bundesliga games.)