|Full name||Eleonora Randolph Sears|
|Country (sports)||United States|
October 28, 1881|
Boston, MA, United States
|Died||March 16, 1968
Palm Beach, FL, United States
|Int. Tennis HoF||1968 (member page)|
|Highest ranking||No.6 (US ranking)|
|Grand Slam Singles results|
|US Open||F (1912)|
|Grand Slam Doubles results|
|US Open||W (1911, 1915, 1916, 1917)|
|Grand Slam Mixed Doubles results|
|US Open||W (1916)|
Eleonora Randolph Sears (September 28, 1881 – March 16, 1968) was an American tennis champion of the 1910s. In addition, she was a champion squash player, and prominent in other sports; she is considered one of the leading all-round women athletes of the first half of the 20th century.
Sears was the daughter of Boston businessman Frederick Richard Sears, a cousin of Henry Cabot Lodge, and a great-granddaughter of Thomas Jefferson. Sears' father was also known for playing the first tennis game in the United States, his opponent being his cousin James Dwight who brought the game from Europe.
Sears was raised in wealth and privilege. She was acquainted with Corinne Douglass Robinson, Eleanor Roosevelt and Alice Roosevelt, all related to President Theodore Roosevelt. She played tennis at a competition organized by Ava Lowle Willing, the wife of John Jacob Astor IV, and she attended the wedding of tennis champion Robert Wrenn. For a while she dated Harold Stirling Vanderbilt, the sporty scion of the Vanderbilt fortune.
Sears won the women's doubles at the US Women's National Championship four times, including three consecutively (1915–1917). In singles, she was a finalist in 1912, where she was beaten in straight sets by Mary Kendall Browne. She teamed with Willis E. Davis to take the national mixed doubles championship in 1916.
Eleonora Sears rode horses competitively and was elected to the US Show Jumping Hall of Fame in 1992. She also owned and raced Thoroughbred horses. She was the first woman to play polo on a men’s team.
Sears was the first female national squash champion, a founder of the Women’s Squash Racquets Association, and coach of the U.S. Women’s International Squash Team. 
She gained media attention for her long distance walks and hikes. As well, she was one of the first American women to drive an automobile and fly a plane.  Her habit of wearing trousers, both when competing in sports and in public, was criticized in media and social circles. 
Grand Slam finals
Singles: 1 (1 runner-up)
|Runner-up||1912||U.S. National Championships||Grass||Mary Kendall Browne||4–6, 2–6|
Doubles: 5 (4 titles, 1 runner-up)
|Winner||1911||U.S. National Championships||Grass||Hazel Hotchkiss|| Dorothy Green
|6–4, 4–6, 6–2|
|Winner||1915||U.S. National Championships||Grass||Hazel Hotchkiss|| Helen McLean
Mrs. G. L. Chapman
|Winner||1916||U.S. National Championships||Grass||Molla Bjurstedt|| Louise Raymond
|4–6, 6–2, 10–8|
|Winner||1917||U.S. National Championships||Grass||Molla Bjurstedt|| Phyllis Walsh
Grace Robert LeRoy
|Runner-up||1919||U.S. National Championships||Grass||Hazel Hotchkiss|| Marion Zinderstein
Mixed doubles: 2 (1 title, 1 runner-up)
|Runner-up||1912||U.S. National Championships||Grass||William Clothier|| Mary Kendall Browne
|4–6, 6–2, 9–11|
|Winner||1916||U.S. National Championships||Grass||Willis E. Davis|| Florence Ballin
- Peggy Miller Franck (June 22, 2012). "The Mother of Title IX: Trailblazing Athlete Eleonora Sears". The Daily Beast.
- "Six Hospitals Contest Will of Eleanora Sears". Palm Beach Daily News. February 22, 1969. Retrieved June 22, 2012 – via Google News Archive.
- Ohnsorg, Roger W. (2011). Robert Lindley Murray: The Reluctant U.S. Tennis Champion. Trafford Publishing. p. 19. ISBN 9781426945137.
- Ohnsborg 2011, p. 309.
- Ohnsborg 2011, p. 292.
- Show Jumping Hall of Fame
- "Will Eleanora Sears Stop Wearing Em Now?: Fashionable Miss Sears Requested by the "Mothers" of Burlingame to Cover". Atlanta Constitution. May 26, 1912. pp. C12D.