Socx (French pronunciation: [sɔks]; from Flemish; Soks in modern Dutch spelling) is a commune in the Nord department in northern France. The population in 2019 was 923.

Socx is around 10 km (6.2 mi) south of Dunkirk. Its area is 8 km² (3.1 sq mi).

The current mayor is Alexandre Rommelaere, elected in 2020. Previous mayors were Christian Ley (term of office: 2008–2020) and Charles Vandaele (2001–2008).

Socx was twinned with Caton, Lancashire, United Kingdom on 12 April 2008.