Helen Newington Wills (October 6, 1905 – January 1, 1998), also known as Helen Wills Moody and Helen Wills Roark, was an American tennis player. She became famous around the world for holding the top position in women's tennis for a total of nine years: 1927–33, 1935 and 1938. She won 31 Grand Slam tournament titles (singles, women's doubles, and mixed doubles) during her career, including 19 singles titles.