Cornelis Dekker

Cornelis Dekker may refer to:


 * Cornelis Bontekoe (1644?–1685), real surname Dekker, Dutch physician
 * Cornelis Gerritsz Decker (1618–1678), Dutch landscape painter
 * Cornelis Decker (historian) (1933–2012), Dutch historian
 * Cees Dekker (born 1959), Dutch scientist