The 181st Field Regiment, Royal Artillery was a unit of the Royal Artillery, raised by the British Army during World War II. First raised as infantry of the 6th Battalion, King's Shropshire Light Infantry from the Welsh Borders, it was converted to the field artillery role, serving in a Scottish formation in the North West Europe campaign in which it was the first British field artillery regiment to cross the Rhine and Elbe rivers.

The King's Shropshire Light Infantry (KSLI) was a light infantry regiment of the British Army, formed in the Childers Reforms of 1881, but with antecedents dating back to 1755. It served in the Second Boer War, World War I, World War II and Korean War. In 1968, the four regiments of the Light Infantry Brigade amalgamated to form The Light Infantry, with the 1st KSLI being redesignated as the 3rd Battalion of the new regiment.