Daniel Auster (Hebrew: דניאל אוסטר , 7 May 1893 – 15 January 1963) was Mayor of Jerusalem in the final years of Mandatory Palestine, the first Jewish mayor of the city, and the first mayor of Jerusalem after Israeli independence.
Daniel Auster was born in the town of Knihinin, near present-day Ivano-Frankivsk, Austria-Hungary (now Ukraine). He immigrated to Ottoman-controlled Palestine prior to World War I after finishing his law studies at the University in Vienna, Austria, from which he graduated in 1914.
He first served at the Austrian expeditionary force headquarters in Damascus, assisting Arthur Ruppin in sending financial help from Constantinople to the starving Yishuv. In 1919, he became Secretary of the Legal Department of the Zionist Commission in Jerusalem. He became Deputy Mayor of Jerusalem under Raghib al-Nashashibi in 1935. In 1937, he became the first Jewish Mayor of Jerusalem. He was also a member of the Assembly of Representatives for the General Zionists party and a signatory of the Israeli Declaration of Independence.
Auster was against the internationalization of Jerusalem and presented his views on this matter to the United Nations in 1947.