This is a list of current, amended, spent and repealed acts of the Parliament of the United Kingdom relating to its former membership and current relationship to the European Communities and the European Union from 1972 onwards.

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Some of the acts (particularly the European Communities Act 1972 and the European Union (Withdrawal) Act 2018) represent some of the most important constitutional legislation formerly or currently on the statute book.

This act legislated for the accession of the United Kingdom to the European Communities which later became the European Union and also gave legal effect to European Union Law (then Community law) which came into effect on 1 January 1973, the day the UK officially joined.

Although the act was repealed by the European Union (Withdrawal) Act 2018 upon the UK's withdrawal from the EU on 31 January 2020, most of its provisions remained in effect via Section 1A of the Withdrawal Act until the end of the Brexit transition period on 31 December 2020.

These acts also amend the 1972 act.

This act legislated for the holding of the United Kingdom European Communities membership referendum which was held on Thursday 5 June 1975.

This act incorporated the agreement which created the European Economic Area which came into effect on 1 January 1994 and amended the European Communities Act 1972 to add the agreement to the act.

These acts legislated for the holding of European Parliament elections within the United Kingdom.

This act amended the 2002 act and legislated for the requirement of a UK-wide referendum for any approval of any proposed transfers of power to the EU.

These acts legislated for subsequent enlargements of the European Communities/European Union and also amended the European Communities Act 1972 to add the treaties to the act.

• Act of Parliament
• European Union Law
• European Court of Justice
• European Atomic Energy Community (Euratom)