Alfred Ernest 'Cap' McDonald (September 17, 1877 – May 1, 1956[1]) was a Canadian professional ice hockey player who played from 1895 to 1914.

He left home at an early age in 1896 to play for the Smiths Falls Hockey Club until 1902.

McDonald, noted to be a tall and husky person, played all positions except goalkeeper during his long hockey career.

McDonald was one of the players who was brought up from the United States to play for the famed Toronto Professionals in 1908.

He played on the following professional teams and leagues: 1905-1906 Michigan Soo Indians International Hockey League (IHL) 1905-1906 Calumet Miners IHL 1906-1907 Calumet Miners IHL 1907-1908 Pittsburgh Lyceum Western Professional Hockey League (WPHL) 1907-1908 Pittsburgh Bankers WPHL 1907-1908 Brantford Indians Ontario Professional Hockey League (OPHL) 1908-1909 Brantford Indians OPHL 1908-1909 Pittsburgh Lyceum WPHL 1908-1909 Toronto Professionals OPHL 1909-1910 Waterloo Colts OPHL 1909-1910 Galt Professionals OPHL 1910 Galt Professionals OPHL – Stanley Cup Challenge against Ottawa Senators 1910-1911 Belleville Eastern Ontario Professional Hockey League (EOPHL) 1910-1911 Brantford Indians OPHL 1911-1912 Montreal Shamrocks Interprovincial Amateur Hockey Union (IAHU) 1912-1913 Montreal St. Pats IAHU 1912-1913 Sydney Millionaires MPHL 1913 Sydney Millionaires MPHL – Stanley Cup Challenge against Quebec Bulldogs 1913-1914 Montreal Wanderers National Hockey Association (NHA