Ashton-in-Makerfield is a market town in Greater Manchester. It is part of the Metropolitan Borough of Wigan and is 4.2 miles (6.8 km) south of the town of Wigan. In 2001 it had a population of 28,505, increasing to 28,762 at the 2011 Census.

Historically a part of Lancashire, Ashton-in-Makerfield was anciently a township in the parish of Newton-in-Makerfield (as Newton-le-Willows was once known), Winwick and hundred of West Derby. With neighbouring Haydock, Ashton-in-Makerfield was a chapelry, but the two were split in 1845. The place has long been a centre for the manufacture of locks and hinges, but also sits on the Lancashire Coalfield, and so was a coal mining district.

The name Ashton derives from Old English and means the "farmstead where the ash-trees grow"; it is a common name and is found locally in Ashton-under-Lyne in Tameside and Ashton upon Mersey in Trafford. The town's name was recorded as Eston in 1212. Later, the suffix "in-Makerfield" was added, which relates the name of the old district of Makerfield of which Ashton was a part; Makerfield derives from the Celtic for a wall or ruin and the Old English word feld, meaning "open land".

Ashton-in-Makerfield was part of the St. Helens Area of the South Lancashire Coalfield. The St Helens Area lay to the South West of the Wigan area and occupied around 60 square miles, skirting Wigan, Warrington, Widnes and to within eight miles (13 km) of Liverpool.

In 1867 there were 13 collieries in the district of Ashton-in-Makerfield. Others followed including Bryn Hall Colliery, owned by Edward Frederick Crippin, the Mains and Park Lane Collieries. Park Colliery and some of those open in 1867 (e.g. Garswood Hall) remained productive until the 1950s.

A number of Ashton's coal miners made a significant impact on modern British history, including: Stephen Walsh M.P.; William Kenealy, V.C. and Lance-Corporal in the 1st Lancashire Fusiliers; and Joe Gormley, President of the National Union of Mineworkers in the 1970s and 1980s.

In the late 19th century, the district was described by one observer as having "extensive collieries, cotton mills and potteries", and famed for the manufacture of "hinges, locks, files and nails". Mills such as the Record Mill (Spinning), situated in York Road, and the Makerfield Mill (the 'Weaving Shed'), in Windsor Road, took over from home-working. Similarly, Thomas Crompton & Sons in Gerard Street, which would eventually employ around 1,200 workers, superseded the subcontracting system that sustained substantial numbers of locally based blacksmiths and other craftsmen.

As recently as the 1970s the district of Ashton-in-Makerfield had one of the highest proportions of derelict land, mainly in the form of spoil tips, left over from coal mining. Major land reclamation schemes have since completely transformed the area.