Ernest Samuel Marks CBE (7 July 1872 – 2 December 1947) was an Australian sporting administrator and politician.

He was born at West Maitland to Wool broker Joseph Marks and Elizabeth, née Benjamin and attended Royston College in Sydney before becoming a wool trader and becoming involved in the running of the family business, Joseph Marks & Co. Marks served as the Nationalist member for North Sydney in the New South Wales Legislative Assembly from 1927 to 1930.

[1] He had also been active in local government through the Civic Reform Association, serving on Sydney City Council from 1920 to 1927 and from 1930 to 1947, with a period as Lord Mayor in 1930.

[6] During his life, Marks worshipped at the Great Synagogue (Sydney) and was part of the Jewish community.

Percy, with Ernest's backing, was instrumental in forming the Australian Jewish Historical Society.