Case citation is a system used by legal professionals to identify past court case decisions, either in series of books called reporters or law reports, or in a neutral style that identifies a decision regardless of where it is reported. Case citations are formatted differently in different jurisdictions, but generally contain the same key information.

Law reports or reporters are series of books that contain judicial opinions from a selection of case law decided by courts. When a particular judicial opinion is referenced, the law report series in which the opinion is printed will determine the case citation format.