Lieutenant-Colonel Sir Ronald Deane Ross, 2nd Baronet MC (13 July 1888 – 31 January 1958) was an Ulster Unionist Northern Irish Member of Parliament (MP). He was the only son of Sir John Ross, 1st Baronet, the last judge to hold the office of Lord Chancellor of Ireland, and Katherine Mary Jeffcock. He succeeded to the title on his father's death in 1935.