Jaji wata al'umma ce a Najeriya kusa da jihar Kaduna a cikin karamar hukumar Igabi (LGA) na jihar Kaduna . Jaji wuri ne na Kwamandan Sojoji da Kwalejin Ma'aikata, Jaji . An buɗe kwalejin a watan Mayun shekara ta alif 1976 tare da kwasa-kwasan manyan hafsoshi biyu bisa la'akari da tsarin karatun da aka samu daga na Kwalejin Sojojin Birtaniyya, Camberley . Har ila yau, Bataliyar Zanga-zanga, da Makarantar Koyon Aikin Artillery, da kuma taimakon kayan yaki daga wata bataliyar sojoji masu sulke a Kaduna duk sun kasance a Jaji. A shekara ta alif 1978, tare da bude sashen koyar da iska, Jaji ya sake yin kwaskwarima a Kwalejin Command and Staff. An kafa malanta a cikin watan Satumban shekara ta alif 1981, tare da tattara dukkanin manyan rundunonin soja a harabar daya. A watan Fabrairun shekara ta 2006, hukumomi suna binciken rahotanni daga Jaji da ke iya nuna mummunar cutar H5N1 ta mura ta yadu zuwa ga mutane. An bayar da rahoton matsalar ne tare da jimina da ake zargin tana da kwayar cutar mura ta Avian a gonar Sambawa da ke Jaji.