The English overseas possessions, also known as the English colonial empire, comprised a variety of overseas territories that were colonised, conquered, or otherwise acquired by the former Kingdom of England during the centuries before the Acts of Union of 1707 between the Kingdom of England and the Kingdom of Scotland created the Kingdom of Great Britain. The many English possessions then became the foundation of the British Empire and its fast-growing naval and mercantile power, which until then had yet to overtake those of the Dutch Republic, the Kingdom of Portugal, and the Crown of Castile.

The Kingdom of England was a sovereign state on the island of Great Britain from the early 10th century, when it emerged from various Anglo-Saxon kingdoms, until 1 May 1707, when it united with Scotland to form the Kingdom of Great Britain, which would later become the United Kingdom. The Kingdom of England was among the most powerful states in Europe during the medieval and early modern colonial periods.