The 191st (South Alberta) Battalion, CEF, was a unit in the Canadian Expeditionary Force during the First World War. Based in Macleod, Alberta, the unit began recruiting during the winter of 1915/16 in that town and the surrounding district. After sailing to England in March 1917, the battalion was absorbed into the 21st Reserve Battalion on June 9, 1917. The 191st (South Alberta) Battalion, CEF, had one officer commanding: Lieutenant-Colonel W. G. Bryan.