189th

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)