Helen Newington Wills Roark (October 6, 1905 – January 1, 1998), also known as Helen Wills Moody, was an American tennis player. She has been described as "the first American born woman to achieve international celebrity as an athlete."

Wills was born Helen Newington Wills in Centerville, California, now part of Fremont, California, and graduated from the University of California, Berkeley. She was already quite famous when she married Frederick Moody in December 1929. She won approximately one-half of her major championships as Helen Wills and one-half as Helen Wills Moody. Wills divorced Moody in 1937 and married Aidan Roark in October 1939.

Wills won 31 Grand Slam titles (singles, women's doubles, and mixed doubles) during her career, including seven singles titles at the U.S. Championships, eight singles titles at Wimbledon, and four singles titles at the French Championships. Excluding her defaults at the French Championships and Wimbledon in 1926, she reached at least the final of each Grand Slam singles event she played during her career.