Eustace Hamilton Miles (22 September 1868 – 20 December 1948) was an English real tennis player, author and restaurateur.

[citation needed] Miles was a prolific author, including collaborations with lifelong friend E. F. Benson with whom he may have had a college romance,[5] on diverse subjects including health (e.g. "Fitness for Play and Work" 1912), athletics ("An Alphabet of Athletics"), diet ("The Failures of Vegetarianism" 1902), ancient history ("A History of Rome up to 500 AD, with Essays, Maps and Aids to Memory" 1901) and Classics ("Comparative Syntax of Greek and Latin").

He married Hallie Killick, also an author, and both engaged in philanthropic works including providing free food and clothing to the poor of London, available during winter months near Cleopatra's Needle, a charitable exercise supported strongly by Queen Alexandra.

[6] Miles's comprehensive regimen combined abstention from alcohol with games, daily practice of gymnastics, personal cleanliness, breathing exercises, and meditation.

[9] In 1904, it was humorously reported in Punch that during the semi-final of a tennis competition, Miles was surrounded by an angry mob who compelled him to eat a meat chop.

and was the owner of a vegetarian restaurant in Chandos Street, Charing Cross that was alleged to have served more than a thousand diners a day.