The siege of Lucknow was the prolonged defence of the British Residency within the city of Lucknow from rebel sepoys during the Indian Rebellion of 1857. After two successive relief attempts had reached the city, the defenders and civilians were evacuated from the Residency, which was then abandoned.

Lucknow is the capital and the largest city of the Indian state of Uttar Pradesh and it is the administrative headquarters of the eponymous district and division. Having a population of 2.8 million as per 2011 census, it is the eleventh most populous city and the twelfth-most populous urban agglomeration of India. Lucknow has always been a multicultural city that flourished as a North Indian cultural and artistic hub, and the seat of power of Nawabs in the 18th and 19th centuries. It continues to be an important centre of governance, administration, education, commerce, aerospace, finance, pharmaceuticals, information technology, design, culture, tourism, music, and poetry.