Marriage—also known as matrimony or wedlock—is the legal and cultural process by which two people join their separate lives as one. The contractual rights and obligations of the parties to a marriage are generally defined by the state, as provided in the state’s statutes (often in the family code), unless otherwise agreed by the parties in a prenuptial or postnuptial agreement. Marriage is intended to last until death, but is often terminated sooner by separation or divorce.

In Indiana, marriage is recognized as a legal union between two individuals, which is regulated under the state's statutes, particularly within the Indiana Code's Title 31 that deals with family law. The state defines the eligibility criteria for marriage, such as age, consent, and the prohibition of bigamy. Indiana does not recognize common-law marriages established within the state after January 1, 1958. Couples entering into marriage may choose to create prenuptial or postnuptial agreements that outline the distribution of assets and financial responsibilities, which can differ from the state's default marital property laws. These agreements must adhere to legal standards to be enforceable. While marriage is intended to be a lifelong commitment, Indiana law provides for the dissolution of marriage through annulment, legal separation, or divorce, each with its own set of legal requirements and processes. It's important for individuals considering marriage or facing marital issues to consult with an attorney to understand their rights and obligations under Indiana law.