Colonel John Suther Williamson CB (c. 1775 – 26 April 1836) was a British Army officer who served in the Royal Artillery during the Napoleonic Wars.
In June 1795, he served on the coast of France, in the expedition to Quiberon Bay to assist the French royalists.
During the Adriatic Campaign, he was at the siege of Ischia in June 1809, and commanded the artillery during the capture of four of the Ionian Islands in October that year.
He received the Waterloo Medal, and was made a Companion of the Order of the Bath, military division, in 1815.
He served with the army of occupation in France, until his promotion to regimental lieutenant-colonel on 24 March 1817, after he returned to England.