Abayomi Gabriel Olonisakin tsohon janar din sojan Najeriya ne mai ritaya kuma tsohon shugaban hafsan tsaron Najeriya. Shugaba Muhammadu Buhari ne ya nada shi kan mukamin a ranar 13 ga watan Yulin shekarar 2015. Ya yi murabus daga ofis a ranar 26 ga watan Janairu, shekara ta 2021. Olonisakin memba ne na 25 Regular Combatant Course na shekara ta 1981. Janar Olonisakin wanda ya fito daga jihar Ekiti ya yi karatun firamare da sakandare a Zariya. Na biyun cikin yaran Mista da Misis Gabriel Olonishakin, Janar Olonisakin sun girma ne a unguwar Odo Ijebu Quarters na Ode Ekiti, karamar hukumar Gbonyin, jihar Ekiti, inda iyayensa ke aiki sosai a cocin CMS na yankin. Ya shiga makarantar Sojan Najeriya, Zariya a 1973 sannan daga baya ya shiga Makarantar Koyon Harkokin Tsaro ta Najeriya a matsayin memba na Kwalejin yaƙi na 25 na yau da kullun. An nada shi a matsayin Laftana ta biyu a cikin Siginal na Sojojin Najeriya a 1981. Olonisakin yana da digiri na farko na Kimiyya tare da girmamawa a Injin Injin da Lantarki daga Jami'ar Obafemi Awolowo, Ife Kafin nadin nasa a matsayin Babban hafsan hafsoshin tsaro, Janar Olonisakin shi ne Kwamandan, Horarwa da Koyarwar Rukuni (TRADOC) Sojojin Nijeriya kuma Kwamanda, na Siginan Sojojin Nijeriya.