Power creep is the gradual unbalancing of a game due to successive releases of new content. The phenomenon may be caused by a number of different factors and, in extreme cases, can be damaging to the longevity of the game in which it takes place.

As new expansions or updates are released, new game mechanics or effects are introduced, making it increasingly difficult for older content to remain in balance without changes. Usually, this means new content releases grow successively more powerful while older content becomes relatively underpowered.

This term is used outside games as well.