Judicial interpretation is the way in which the judiciary construes the law, particularly constitutional documents, legislation and frequently used vocabulary. This is an important issue in some common law jurisdictions such as the United States, Australia and Canada, because the supreme courts of those nations can overturn laws made by their legislatures via a process called judicial review.

For example, the United States Supreme Court has decided such topics as the legality of slavery as in the Dred Scott decision, and desegregation as in the Brown v Board of Education decision, and abortion rights as in the Roe v Wade decision. As a result, how justices interpret the constitution, and the ways in which they approach this task has a political aspect. Terms describing types of judicial interpretation can be ambiguous; for example, the term judicial conservatism can vary in meaning depending on what is trying to be "conserved". One can look at judicial interpretation along a continuum from judicial restraint to judicial activism, with different viewpoints along the continuum.

Phrases which are regularly used, for example in standard contract documents, may attract judicial interpretation applicable within a particular jurisdiction whenever the same words are used in the same context.

In the United States, there are different methods to perform judicial interpretation:

Balancing happens when judges weigh one set of interests or rights against an opposing set, typically used to make rulings in First Amendment cases. For example, cases involving freedom of speech sometimes require justices to make a distinction between legally permissible speech and speech that can be restricted or banned for, say, reasons of safety, and the task then is for justices to balance these conflicting claims. The balancing approach was criticized by Supreme Court justice Felix Frankfurter who argued that the Constitution gives no guidance about how to weigh or measure divergent interests.

Doctrinalism considers how various parts of the Constitution have been "shaped by the Court's own jurisprudence", according to Finn.