John II, Count of Blois

John II of Châtillon (died 1381, in Valenciennes), second son of Louis I of Châtillon and Jeanne of Avesnes, was count of Blois and lord of Avesnes from 1372 to 1381.
In February 1372, he married Mathilde of Guelders (d. 1384), the daughter and co-heir of Duke Reginald II of Guelders, and became Lord of Schoonhoven and Gouda. He spent most of his career trying to seize Guelders from Mathilde's nephew William I of Guelders and Jülich.