Great Dunmow is a historic market town and civil parish in the Uttlesford district of Essex, England. It is situated on the north of the A120 road, approximately midway between Bishop's Stortford and Braintree, 6 miles east of London Stansted Airport.

Originally the site of a Roman settlement on Stane Street, the town thrived during the Middle Ages. Many buildings survive from this period, including a sixteenth-century town hall. Dunmow means "Meadow on the Hill". The settlement was variously referred to as Dunmow Magna, Much Dunmow, or most commonly Great Dunmow. As of 2021, Robert Nicholson is Emeritus Mayor of Great Dunmow.

The town museum, the Maltings Museum, is situated on Mill Lane and covers local history. Great Dunmow is also the Home of Talliston House & Gardens, an ex-council house transformed by owner John Tarrow (née Trevillian) into 'Britain's most extraordinary home' (The Times). The house and gardens has been open to the public since 2015 and includes thirteen fantasy locations, each set in a different time and place.

The town is well known for its four-yearly ritual of the "Flitch Trials", in which couples must convince a jury of six local bachelors and six local maidens that, for a year and a day, they have never wished themselves unwed. If successful the couple are paraded along the High Street and receive a flitch of bacon. The last flitch trials were held in the town in the summer of 2016, with the next scheduled for 2022. (The trials scheduled for 2020 did not take place because of the coronavirus pandemic.) The custom is ancient, and is mentioned in the Wife of Bath's Prologue and Tale in Chaucer's The Canterbury Tales. It acts as a major plot point in the 1952 film Made in Heaven, starring Petula Clark and David Tomlinson.