Heilly (French pronunciation: [ɛji]; Picard: Heillin) is a commune in the Somme department in Hauts-de-France in northern France.

Heilly is situated on the D52 road, some 12 miles (19 km) northeast of Amiens.

During the First World War, being on the railway line Amiens-Albert meant receiving many of the dead bodies from the Battle of the Somme. Over 3000 graves are in the military cemetery.

Historical population

Year Pop. ±% p.a. 1841 794 —     1901 472 −0.86% 1962 367 −0.41% 1968 346 −0.98% 1975 343 −0.12% 1982 353 +0.41%	Year Pop. ±% p.a. 1990 391 +1.29% 1999 399 +0.23% 2007 407 +0.25% 2012 390 −0.85% 2017 424 +1.69%
Source: EHESS and INSEE (1968-2017)

• Communes of the Somme department