Aartje Johanna "Atie" Voorbij (born 20 September 1940) is a retired Dutch butterfly swimmer who won a gold medal in the 4×100 m medley team event (together with Ada den Haan, Cocky Gastelaars and Lenie de Nijs) at the 1958 European Aquatics Championships. She also won a silver medal in 100 m butterfly at the same championships. She participated in the 1960 Summer Olympics and was fifth in 100 m butterfly. Between 1955 and 1960 she was five times national champion in 100 m butterfly and set nine world records in the 100 m butterfly and 4×100 m medley events.