| Abayomi Olonisakin | |
| Honorific Prefix: | General |
| Office1: | Chief of Defence Staff |
| Term Start1: | 21 July 2015 |
| Term End1: | 29 January 2021 |
| Predecessor1: | Alex Sabundu Badeh |
| Successor1: | Lucky Irabor |
| Office2: | Commander of TRADOC |
| Term Start2: | September 2013 |
| Term End2: | July 2015 |
| Predecessor2: | Salihu Zaway Uba |
| Successor2: | Mobolaji Koleoso |
| Office3: | Commander of the Nigerian Army Corps of Signals |
| Term Start3: | January 2013 |
| Term End3: | September 2013 |
| Birth Date: | 2 December 1961[1] |
| Birth Place: | Ekiti state, Nigeria |
| Serviceyears: | 1979 – 2021 |
| Rank: | General |
| Commands: | Chief of Defence Staff Commander of TRADOC Commander of the Army Corps of Signals |
| Alma Mater: | Nigeria Military School Nigerian Defence Academy Obafemi Awolowo University |
| Allegiance: |  Nigeria |
| Branch: | Nigerian Army |
Abayomi Gabriel Olonisakin (born 2 December 1961) is a retired Nigerian Army general, former Chief of Defence Staff, and current Nigerian Ambassador to the Republic of Cameroon.[2] He was appointed to the position of Chief of Defence Staff on 13 July 2015 by President Muhammadu Buhari.[3] He resigned from office on 29 January 2021.[4]
General Olonisakin who hails from Ekiti State[5] and had his elementary and secondary education in Zaria. The third of five children, Olonisakin grew up in the Odo Ijebu Quarters of Ode Ekiti, Gbonyin local government area, Ekiti State, where his parents were active member of the local CMS church.[6] He enrolled at the Nigerian Military School, Zaria in 1973[7] and later joined the Nigerian Defence Academy as a member of the 25th Regular Combatant Course. He was commissioned as a 2nd Lieutenant into the Nigerian Army Signal Corps in 1981. Olonisakin holds a Bachelor of Science degree with honours in Electrical and Electronics Engineering from Obafemi Awolowo University in Ife.
Prior to his appointment as Chief of Defence Staff, General Olonisakin was commander of the following formations
Olonisakin was promoted to General in August 2015 by President Muhammadu Buhari upon his confirmation as Chief of Defence Staff.[10]
In October 2022, a Nigerian national honour of Commander of the Order of the Federal Republic (CFR) was conferred on him by President Muhammadu Buhari.[11]