A number of nations have a Seventh Army:
Germany 7th Army (German Empire), a World War I field army 7th Army (Wehrmacht), a World War II field army
Russia/Soviet Union 7th Army (Russian Empire) 7th Army (RSFSR) 7th Army (Soviet Union)
Others Seventh Army (France) Seventh Army (Italy) Seventh Army (Ottoman Empire) 7th Army (Austria-Hungary) Seventh United States Army 7th Army (Kingdom of Yugoslavia) Seventh Army (Nationalist China)