David Tidhar (Hebrew: דוד תדהר; 1897 – 1970) was a Jewish-Israeli police officer, private detective and author.

[1] Prior to the outbreak of World War I, Tidhar founded a sanitary corps that offered advice on how to prevent cholera during the 1916 epidemic and a clothing and shoe distribution program for the impoverished Jewish community.

[1] Tidhar volunteered for the Jewish Legion in 1918 and helped protect Jews during the Jaffa riots of 1921.

[1] Shlomo Ben-Yisrael, who founded The Detective Library in 1930, wrote a series of weekly chapbooks with Tidhar as the protagonist.

Tidhar went on to edit the 19-volume Encyclopedia of the Founders and Builders of Israel; a non-fiction study of crime in Palestine; and an autobiography.