Zenzo Shimizu

, also spelt Zenzo Shimidzu, was a Japanese tennis player.

Shimizu graduated from the Tokyo Higher Commerce School (now Hitotsubashi University). In 1912, he started to work for Mitsui & Co. He married the daughter of Sohōka. He resided in Calcutta and New York. In 1929 he was transferred to Mitsui Life Insurance Co., became the manager of Kobe Branch, in 1945 the director thereof and thereafter was expelled from his official position after World War II. He was running a trading company in Kobe thereafter. In 1965 he collapsed from a stroke. In 1977 he died in Osaka at the age of 86.

While having this educational background and career he reached the All-Comers final of the Wimbledon Championships in 1920, where he lost to Bill Tilden 4–6, 4–6, 11–13. At the 1921 Wimbledon Championships he reached the semifinal which he lost to Manuel Alonso in five sets. He also was a member of Japan's Davis Cup team that finished second to United States in 1921. In 1921 he won the singles title at the London Championships by defeating Mohammed Sleem in the final in straight sets. He established the earliest period of Japanese tennis together with Ichiya Kumagae (accurately speaking, Kumagai).

Shimizu was ranked World No. 4 by A. Wallis Myers of The Daily Telegraph in 1921. In his book The Art of Lawn Tennis Bill Tilden describes Shimuzu as a baseline player and marvelous court coverer with an uncanny accuracy in his shots. In comparing Shimuzu to his countryman Kumagae he states that Shimizu had a superior backhand and low volleying skills but lacked Kumagae's forehand drive and had a weaker service. Their high volleying skills and overheads were judged equal. Career finals (15) Titles (10) 1913: Bengal Championships 1916: Bengal Championships (2) 1918: Bengal Championships (3) 1918: Western India Championships 1919: Bengal Championships (4) 1920: Bengal Championships (5) 1920: North London Championships 1920: Sheffield and Hallamshire Championships 1921: London Championships 1922: Greenwich Tennis Club Invitation

Runners-Up (5) 1914: Bengal Championships 1916: Western India Championships 1919: Western India Championships 1920: Kent Championships 1922: U.S. Clay Court Championships