Marriage in Scotland is recognised in the form of both civil and religious unions between individuals. Historically, the law of marriage has developed differently in Scotland to other jurisdictions in the United Kingdom as a consequence of the differences in Scots law and role of the separate established Church of Scotland. These differences led to a tradition of couples from England and Wales eloping to Scotland, most famously to marry at border towns such as Gretna Green. The legal minimum age to enter into a marriage in Scotland is sixteen years and does not require parental consent at any age.

Marriage is available in England and Wales to both opposite-sex and same-sex couples and is legally recognised in the forms of both civil and religious marriage. Marriage laws have historically evolved separately from marriage laws in other jurisdictions in the United Kingdom. There is a distinction between religious marriages, conducted by an authorised religious celebrant, and civil marriages, conducted by a state registrar. The legal minimum age to enter into a marriage in England and Wales is 18 since 27 February 2023. Previously the minimum age of marriage was 16, with parental permission. This also applies to civil partnerships.