John Ambrose "Jack" MacKell (December 4, 1894 – November 25, 1961) was a Canadian professional hockey player who played two seasons in the National Hockey League (NHL) for the Ottawa Senators between 1919 and 1921.

He was born in Ottawa, Ontario.

Mackell played for several seasons in the Ottawa City Hockey League before joining the Senators in 1919.

He played 45 games over two seasons in the National Hockey League with the Ottawa Senators before returning Ottawa City League where he played two more seasons before retirement.

His son Fleming Mackell also played in the NHL.