Coordinates: 51°20′N 0°44′E / 51.34°N 0.74°E / 51.34; 0.74

Sittingbourne is an industrial town about eight miles (12.9 km) east of Gillingham in England, beside the Roman Watling Street off a creek in the Swale, a channel separating the Isle of Sheppey from mainland Kent. The town is growing rapidly due to a number of large residential developments, and its train line links to London Victoria and HS1 to St Pancras International, the journey taking about an hour from Sittingbourne railway station.

Sittingbourne owes its name to a modernised version of an observation on its location. The town's name came from the fact that there is a small stream or "bourne" running underground in part of the town. Hasted writing in the 1790s in his History of Kent states that:

The Kent Hundred Rolls of 1274-5, preserved in the National Archives, record Sittingbourne as Sydingeburn in the following entries " Item dicunt quod Johannes Maresescall de Synele tenet unam parvam purpresturam in villa de Sydingeburn et solvit domino regi per annum 1d et dominus rex nichil perdit et quod Petrus de London tenet unam parvam purpresturam in villa de Sydingeburn et solvit inde per annum domino regi 1d et rex nichil perdit." Translated as, "Then they say John Marshall de Synele holds one small encroachment in the vill of Sittingbourne and he pays the lord king 1d. each year and the lord king loses nothing and that Peter of London holds one small encroachment in the vill of Sittingbourne and he pays 1d. each year to the lord king and the king loses nothing."