Chauny is a commune 35 kilometres west of Laon. Chauny Communal Cemetery British Extension can be reached from the direction of Ham following the D937, Ham to Chauny road. It is necessary to cross a major road, the N32. Shortly after the junction the approach to Chauny is via a roundabout and a small industrial estate. After several hundred metres a left turn must be made at the first set of traffic lights, following the CWGC sign. Chauny Communal Cemetery British Extension will be found 300 metres after the junction on the right side of the road.

The Extension was made after the Armistice for the burial of remains brought in from the battlefields of the Aisne and from numerous smaller cemeteries in the surrounding countryside. There are just over 1000 World War I casualties commemorated at this site. The majority of them died in 1918; most of the rest died in September, 1914. Included in the total figure are six soldiers of the United Kingdom whose identity has been established with reasonable, but not absolute certainty and who are commemorated by special memorial headstones bearing the superscription 'Believed to be', and 26 soldiers of the United Kingdom and 5 of Canada whose graves could be identified collectively but not individually and who are commemorated by special memorial headstones bearing the superscription 'Buried near this spot'. There are also 26 soldiers of the United Kingdom who are commemorated in the cemetery as follows: 22 whose graves are lost but are commemorated by special memorial headstones inscribed to that effect, with the additional inscription 'Their glory shall not be blotted out'; 3 who are commemorated by special memorial headstones bearing the superscription 'Believed to be buried in this cemetery'; and one, whose grave is known to be in the cemetery although the exact place of burial could not be established, is commemorated by a special memorial headstone inscribed 'Buried in this cemetery'. The Cemetery Extension covers an area of 3,729 square metres.