Order of Saint John or Knights Hospitaller is a chivalric order of the Crusades and early modern period, after 1530 also known as "Knights of Malta"
Order of Saint John of Jerusalem may also refer to:
Sovereign Military Order of Malta (since 1822), officially Sovereign Military Hospitaller Order of Saint John of Jerusalem, of Rhodes and of Malta, modern Catholic continuation of the Order of Saint John
Order of Saint John (chartered 1888), whose Sovereign Head is the monarch of the Commonwealth realms; based in London, its responsibilities include overseeing St. John Ambulance and the St. John Eye Hospital in Jerusalem
Russian tradition of the Knights Hospitaller, the Russian Orthodox tradition from the Knights Hospitaller, springing from the Grand Mastership of Emperor Paul I of Russia (1799)