The Statute of Westminster of 1275 (3 Edw. 1), also known as the Statute of Westminster I, codified the existing law in England, into 51 chapters. Chapter 5 (which mandates free elections) is still in force in the United Kingdom^[1] and the Australian state of Victoria^[2] whilst part of Chapter 1 remains in force in New Zealand.^[3] It was repealed in Ireland in 1983.

William Stubbs gives a summary of the Statute:^[4]

This act is almost a code by itself; it contains fifty-one clauses, and covers the whole ground of legislation. Its language now recalls that of Canute or Alfred, now anticipates that of our own day; on the one hand common right is to be done to all, as well poor as rich, without respect of persons; on the other, elections are to be free, and no man is by force, malice or menace, to disturb them. The spirit of the Great Charter is not less discernible: excessive amercements, abuses of wardship, irregular demands for feudal aids, are forbidden in the same words or by amending enactments. The inquest system of Henry II of England, the law of wreck, and the institution of coroners, measures of Richard and his ministers, come under review as well as the Provisions of Oxford and the Statute of Marlborough.

Though it is a matter of dispute when peine forte et dure (Law French for "hard and forceful punishment") was first introduced, chapter 3 states that those felons standing mute shall be put in prison forte et dure.^[5]

The Statute of Westminster of 1275 was one of two English statutes largely drafted by Robert Burnell and passed during the reign of Edward I. Edward I had returned from the Ninth Crusade on 2 August 1274 and was crowned King of England on 19 August.^[6] His first Parliament was summoned for the quinzaine of the Purification on 16 February 1275 but was prorogued until the day after Easter on 22 April 1275, but did not meet until the week commencing 29 April or, according to Chronicle records, until the beginning of May, for unknown reasons.^[7] It met at Westminster, its main work being the consideration of the Statute of Westminster I, the agreement of new levies in Ireland and allowing the King to levy a new tax on wool.^[7] This was drawn up, not in Latin, but in Norman French, and was passed "by the assent of Archbishops, Bishops, Abbots, Priors, Earls, Barons, and [all] the Commonalty of the Realm, being thither summoned."^[1]

According to Yuen Yuen Ang, the statute replaced a previously communal regime of contract enforcement with one based on "individual responsibility, territorial law, the central administration of justice, and personal collateral."^[8]: 144

The Statute of Westminster I is composed of 51 chapters:

In the early history of the Lordship of Ireland, English statutes were often applied to Ireland.^[11] A 1285 writ authorised Stephen de Fulbourn, then Justiciar of Ireland, to apply there English statutes including Westminster I, Westminster II, Gloucester, and those of merchants.^[12] A 1320 act of the Parliament of Ireland (13 Edw. 2 c.2) readopted all these statutes.^[13] An act of Edward Poynings' 1495 session of the Parliament of Ireland adopted statutes "formerly made for the common weal" in England; later the Maintenance and Embracery Act 1634 adopted all English statutes dealing with champerty and maintenance and embracery. Many chapters of the 1275 English statute were repealed with respect to Ireland by the Statute Law (Ireland) Revision Act 1872.^[14] In the Republic of Ireland, the Short Titles Act 1962 assigned the short title "Distress Act 1275" to chapter 16 of the 1275 English statute, as adopted under the 1495 Irish act;^[15] and the short title "Maintenance and Champerty Act 1275" to chapters 25 and 28 of the 1275 English statute, as adopted under the 1634 Irish act.^[16] The Statute Law Revision Act 1983 repealed the whole of the 1275 English statute and the 1285 and 1320 Irish statutes.^[17]

• Statute of Westminster 1285
• Quia Emptores of 1290 is sometimes called the statute of Westminster III^[18]