Lees is a village in the Metropolitan Borough of Oldham, amongst the Pennines east of the River Medlock, 1.8 miles (2.9 km) east of Oldham, and 8.2 miles (13.2 km) northeast of Manchester.

In the 14th century, when John de Leghes was a retainer of the local Lord of the Manor, Lees was a conglomeration of hamlets, ecclesiastically linked with the township of Ashton-under-Lyne. Farming was the main industry of this rural area, with locals supplementing their incomes by hand-loom weaving in the domestic system. At the beginning of the 19th century, Lees had obtained a reputation for its mineral springs; ambitions to develop a spa town were thwarted by an unplanned process of urbanisation caused by the rise of textile manufacture during the Industrial Revolution.

Lees expanded into a mill town in the late-19th century, on the back of neighbouring Oldham's boom in cotton spinning. Lees Urban District had eleven cotton mills at its manufacturing zenith.

The settlement dates back to the 14th century and is thought to have been named after former retainer of the manor, John de Leghes.

Lees was one of the localities which, on 16 August 1819, sent a contingent of parishioners to the mass public demonstration at Manchester, now known as the Peterloo massacre. In the week before Peterloo (an assembly demanding the reform of parliamentary representation), weavers in Lees had paraded through the village with a large black flag adorned with the slogans "no Borough Mongering, Taxation Without Representation is Unject and Tyrannical," and "Unite and be Free, Equal Representation or Death". The growing unrest in the village prompted one alarmed inhabitant to write to the Home Office.

In the late-18th century, a natural chalybeate spring was discovered in the locality, and by the-early 19th century the village gained a reputation for these "fashionable" mineral springs. In the early 19th century, water from Lees Spa, had become fashionable to drink, so much so, that it was bottled and sold around the country. In the month of August 1821, 60,000 people visited Lees Spa. Ambitions to develop Lees into a spa town - "Lancashire's very own Harrogate"[ - were thwarted by an unplanned process of urbanisation caused by introduction and profitability of textile manufacture during the Industrial Revolution. The Industrial Revolution brought cotton spinning to Lees in the form of eleven mills, which by the late-19th century, had changed the character of the village completely.

Lees has grown in size recently in terms of both amenities and residential population, in its role as a commuter village for people working in Oldham and West Yorkshire. It is home to commercial and distribution companies. The main street is notable for the number of public houses in close proximity.