Sir Pierre Louis Napoleon Cavagnari KCB CSI (4 July 1841 – 3 September 1879) was an Italian-British military administrator. Cavagnari was the son of Count Louis Adolphus Cavagnari, of an old family from Parma in the service of the Bonaparte family, by his marriage in 1837 with an Anglo-Irish woman, Caroline Lyons-Montgomery. Cavagnari was born at Stenay, in the Meuse département, France, on 4 July 1841. He was killed on 3 September 1879 during the siege of the British Residency (then at Bala Hissar) in Kabul in Afghanistan.