James Halliday may refer to:
James Halliday (Canadian politician) (1845–1921), represented Bruce North in the Canadian House of Commons from 1901 to 1904 James Halliday (weightlifter) (1918–2007), British weightlifter James Halliday (writer) (born 1938), Australian wine critic and writer Jimmy Halliday (1927–2013), leader of the Scottish National Party 1956–1960 James Halliday, a deceased character in the novel, Ready Player One