State and federal courts have long held that governments may exercise police power over the use of land, for example through local zoning ordinances. However, in rare instances, government regulation may burden property to such a degree as to constitute an unconstitutional “taking,” even if the government did not take any actual ownership or possession of the property. Such “regulatory takings” may be challenged under Article I, Section 13 of the Wisconsin Constitution and the “takings clause” of the Fifth Amendment to the U.S. Constitution, which prohibit governments from taking private property for public use without just compensation. This issue brief provides an overview of the tests courts use when analyzing whether such a “regulatory taking” has occurred. It also summarizes a 2017 U.S. Supreme Court decision, Murr v. Wisconsin, which addressed a question that had arisen in this area of law.