Helen Hull Jacobs (August 6, 1908 - June 2, 1997, Globe, Arizona) was an American tennis player. She was a former number 1 ranked player. Jacobs won the championship at Wimbledon in 1936. She won a total of 10 Grand Slam titles. Jacobs won the US National championship in singles (1932-1935), doubles (1932, 1934-35) and mixed doubles (1934). She is best known for her rivalry with Helen Wills Moody.