Peter John Fane de Salis, (5th) Count de Salis-Soglio, Count of the Holy Roman Empire, DL, JP, G.C.J.J., K.R.E. (26 February 1799 – 24 December 1870) was a mercenary soldier and landowner in Middlesex and the Irish counties Limerick and Armagh. He was Bailiff of the English Venerable Order of Saint John of Jerusalem and Grand Prior of the Irish one. He was also an hereditary Knight of the Golden Spur/Eques Auratus and Papal Count Palatine of the Lateran.