Dinnington is a town in the civil parish of Dinnington St John's, in the Metropolitan Borough of Rotherham, in South Yorkshire, England. It is near to the towns of Worksop and Rotherham and cities of Sheffield and Doncaster.

Historically part of the West Riding of Yorkshire, Dinnington is the principal settlement in the civil parish of Dinnington St John's, which also includes the small satellite hamlets of Throapham and St John's. The Dinnington St John's parish is the most populous constituent of the St John's ward, which also includes the parishes of Laughton-en-le-Morthen, Firbeck, Letwell and Gildingwells. In 2001 this ward had a population of 11,476, with Dinnington St John's itself making up 9,161 of that figure. The population of the ward at the 2011 Census had increased to 12,517. Dinnington is about 330 feet (101 m) above sea level.

Excavations show Dinnington to have been inhabited since at least Neolithic times, and it has been suggested that the settlement takes its name from a local barrow, though a more traditional interpretation of "Dinnington" would be "Dunn's Farmstead", or "Town of Dunn's People".

Dinnington was originally a small, isolated farming community, based around the New Road area of the town. Quarrying in the area helped expand the population, but it was the sinking of the Dinnington Main Colliery in 1905 that led to the real growth of the settlement. The census of 1911 shows a twenty-fold increase in population of the parish since 1901, from 250 to 5,000. In 1951 the parish had a population of 7,053.

The coal miners initially lived in a prefabricated shanty town in Laughton Common, colloquially known as "Tin Town" or "White City" but later moved into colliery-built terrace houses around the central shopping area of Laughton Road.

Dinnington was an ancient parish which became a civil parish in 1866. On 1 April 1954 the civil parish was abolished and merged with the civil parish of St Johns with Throapham, to form the civil parish of Dinnington St John's.

Dinnington continued to expand throughout the 20th century, largely through the growth of commuter living that followed the Second World War. As the housing estates spread, Dinnington began to merge seamlessly into the neighbouring settlements of Throapham and North Anston. The result is a 2.2 miles (3.5 km) strip of urban development that mainly acts as a commuter base for Sheffield, Rotherham and Worksop, although with the closure of coal mines and steel mills, the area saw a rapid decline in the late 1980s and early 1990s and despite steady growth, still boasted the highest level of unemployment in the UK in 2001.

Dinnington Colliery was closed in 1992. This damaged the local community, and had a large negative impact on the local economy with initial job losses and knock-on effect closures to local business. In 2019 Conservative Alexander Stafford was voted as the MP for the Rother Valley constituency, of which Dinnington is a part, many in Dinnington were understandably unhappy given the towns history with Conservative party. In 2023 Councillor Charlie Wooding was removed from his position after it was revealed that he had failed to attend council meeting while continuing to claim his wages, causing outrage in the town, a by-election was triggered and local resident Julia Hall was elected to take his place