Gwersyllt (pronounced [ɡwɛrsɪɬt]) is an urban village and community in Wrexham County Borough, Wales.
The densely populated village is one of Wrexham's largest and is situated in the north western suburbs of the city, bordering the nearby villages of Llay, Cefn-y-Bedd, Brynteg, and Pentre Broughton. The community, also including the villages of Summerhill, Sydallt, Rhosrobin and Bradley, had a total population of 10,056 at the 2001 census, rising to 10,677 at the 2011 Census.
The name is usually stated to be derived from the Welsh word, gwersyll, meaning "campsite", with the final t common in the area's dialect. This is, however, a comparatively modern form, and during the mediaeval period the name was written as "Wershull" or "Wersull", with "Gwershull" and "Wersham" occurring in the 16th century. It is therefore possible that the present name, like others in the area, is a Welsh adaptation of an earlier English name ending in "-hull" (i.e. "hill"). A derivation from the genitive singular of Old English wearga, with the meaning "[the] felon's hill", "gallowstree hill", has been suggested by placename scholar Melville Richards, although an original form of Wersiges-hyll from an Old English personal name has also been suggested.