Vasilissa Olga (Greek: ΒΠ Βασίλισσα Όλγα) was a Greek destroyer of the Vasilefs Georgios (modified G) class, which served with the Royal Hellenic Navy during the Second World War, becoming its most distinguished and successful ship until her loss in 1943. She was named after Queen Olga of Greece, the wife of King George I, and was the second ship to bear this name. Built by Yarrow & Company (Scotstoun, Scotland), along with her sister ship, Vasilefs Georgios, she was the most modern ship of the Greek Navy at the outbreak of the Second World War.