Thomas James O'Neill (2 June 1882 – 16 October 1965) was a Liberal party member of the House of Commons of Canada. He was born in Winnipeg, Manitoba and became a locomotive engineer by career. From 1897 to 1900, he was a member of the Rocky Mountain Rangers. O'Neill was active on various boards and committees, including chairing the British Columbia Railway Legislation Board at one time. He also served on the General Committee of Adjustment for Canadian Pacific Railway. He was an active supporter of labour unions, particularly the Brotherhood of Locomotive Engineers.