189th may refer to:
189th (Canadien-Français) Battalion, CEF, a unit in the Canadian Expeditionary Force during the First World War 189th Airlift Squadron, a unit of the Idaho Air National Guard that flies the C-130 Hercules 189th Airlift Wing, an airlift unit located at Little Rock AFB, Arkansas 189th Infantry Brigade (United States) 189th (2nd York and Durham) Brigade, a formation of the British Army during the First World War
See also 189 (number) AD 189, the year 123 (CLXXXIX) of the Julian calendar