Julius Kahn (February 28, 1861 - December 18, 1924), was a United States congressman who was succeeded by his wife Florence Prag Kahn after his death. Kahn was born in Kuppenheim, in the Grand Duchy of Baden, in what would become Germany, on February 28, 1861. He immigrated to the United States with his parents, who settled in California in 1866. After studying law in San Francisco, he was elected a member of the State assembly in 1892 and admitted to the bar in January 1894. He was elected as a Republican to the 56th and 57th Congresses (March 4, 1899-March 3, 1903). Although he unsuccessfully contested the election of Edward J. Livernash to the 58th Congress; he was elected to the 59 and to the nine succeeding Congresses and served from March 4, 1905, until his death in 1924.
During his time in the House of Representatives he was noted as an advocate of military preparedness. He helped draft and secure the passage of the National Defense Act of 1915, the Selective Draft Act of 1917, and the National Defense Act of 1920. He served as chairman of Committee on Military Affairs (66th-68th Congresses).
At the time of his death, he had been re-elected to the 69th Congress. His wife, Florence Prag Kahn, succeeded him in Congress and served until 1937. He was buried in the Home of Peace Cemetery, Colma, Calif. A well-known park in San Francisco has been named in his honor.