John Paul Papanicolaou (1949 – 14 February 2010) was a Greek businessman active in the shipping industry. A friend of the Onassis family, he is best known for his purchase and restoration of the Onassis yacht, Christina O in 1998, adding the O. to the ship's name.^[1][2] He also purchased the now decaying former Yugoslavian presidential yacht Galeb, which was the third largest yacht in the world at one time.^{[citation needed]}

John-Paul Papanicolaou died in Athens, Greece on February 14, 2010 after two years with cancer.