In the broadest possible sense, case stacking can be defined as a phenomenon where a noun (or a pronoun, adjective) is followed by two or more adjacent case markers. This entry focuses on two central issues related to case stacking. The first issue is under what morphosyntactic conditions case stacking arises (e.g. agreement, noun ellipsis, phrasal case marking, multiple case assignment). The second issue is what the morphosyntactic consequences of case stacking are (the appearance of ‘dummy’ morphemes; deletion of case morphemes; the fusion of consecutive case morphemes).