Barbara Christina Elisabeth Helsingius-Koski (née Helsingius; 27 September 1937 – 9 March 2017) was a Finnish singer, poet, and Olympic fencer. She participated at the 1960 Summer Olympics. She was born in Helsinki.
Helsingius became well-known internationally, and was a member of Visens venner in Norway. She was a member of the joint Nordic cultural organisation NordVisa.
Helsingius died from a long illness on 9 March 2017 in Espoo, Finland. She was 79 years old.