Carnoy (French pronunciation: [kaʁnwa]; Picard: Carneu) is a former commune in the Somme department in Hauts-de-France in northern France. On 1 January 2019, it was merged into the new commune Carnoy-Mametz.

Carnoy is situated on the D254 road, some 43 km (27 mi) northeast of Amiens.

Historical population of Carnoy

Year	1962	1968	1975	1982	1990	1999	2006
Population	72	82	74	83	98	85	75
From the year 1962 on: No double counting—residents of multiple communes (e.g. students and military personnel) are counted only once.

In the First World War, the area was the site of heavy fighting, particularly during the Battle of the Somme. It was also one of the sites where large British mines were exploded on the first day that battle.

• Communes of the Somme department