Dosrius is a municipality in the comarca of Maresme in Catalonia, Spain, located in the interior of the comarca on the border with the Eastern Valleys, and is at the head of the Argentona Riera. The original name, first recorded in 963, is "Duos Rios". This literally means "Two Rivers" and refers to the 2 rivers that join to form the Argentona Riera, and is reflected in the coat of arms.