Common law marriage—also known as marriage without formalities or informal marriage—is marriage without a wedding or marriage ceremony and without a marriage license. Some states recognize common law marriage under certain circumstances—such as when the parties agree to be married, live together (cohabit) after agreeing to be married, and represent to others that they are married (holding themselves out as a married couple).

Other states previously recognized common law marriages, but no longer recognize such marriages after a certain date on which the law was changed—usually by statute. In other states, common law marriage has not been recognized by the legislature in a statute, but the courts have recognized common law marriage in court opinions or case law.

Arizona does not recognize common law marriages created within the state. This means that couples cannot become legally married in Arizona without obtaining a marriage license and having a marriage ceremony. However, Arizona does recognize common law marriages that were legally established in other states where such marriages are recognized. This means that if a couple legally enters into a common law marriage in a state that recognizes such unions, and they later move to Arizona, their marriage will be recognized by Arizona law. It is important for individuals in such relationships to understand their legal rights and obligations, and they may wish to consult with an attorney for guidance specific to their situation.