 Welwyn is twinned with the village of Champagne-sur-Oise in the "département" of Val-d'Oise, just north of Paris.The connection is organised in Welwyn by the Welwyn Anglo-French Twinning Association (WAFTA).The twinning arrangement was entered into in 1973, as a result of a visit to Champagne-sur-Oise by the headmaster and pupils of St Mary's School, Welwyn, setting up a cultural association which has continued since then.