英格兰联邦（英语：Commonwealth of England），1649年由英国国会成立，统治英格兰。在奥利弗·克伦威尔入侵苏格兰后，从1653年5月起开始统治苏格兰，之后统治权扩大至爱尔兰。是第一个统治全英国的共和政府。

1653年，奥利弗·克伦威尔解散残余国会，自任为护国公，将国号改为英格兰、苏格兰与爱尔兰联邦（Commonwealth of England, Scotland and Ireland）。1660年，查理二世复辟结束了这段共和国时期，国号改为英格兰王国。

The Commonwealth was the period from 1649 onwards when England, along later with Ireland and Scotland, was ruled as a republic following the end of the Second English Civil War and the trial and execution of Charles I. The republic's existence was declared through "An Act declaring England to be a Commonwealth", adopted by the Rump Parliament on 19 May 1649. Power in the early Commonwealth was vested primarily in the Parliament and a Council of State. During the period, fighting continued, particularly in Ireland and Scotland, between the parliamentary forces and those opposed to them, as part of what is now referred to as the Third English Civil War.