| Joseph Olatunji Ajayi | |
| Width: | 150px |
| Office1: | Senator for Ekiti North |
| Term Start1: | 29 May 1999 |
| Term End1: | 29 May 2003 |
| Successor1: | James Kolawole |
| Birth Place: | Ekiti State, Nigeria |
Joseph Olatunji Ajayi was elected Senator for the Ekiti North constituency of Ekiti State, Nigeria at the start of the Nigerian Fourth Republic, running on the Alliance for Democracy (AD) platform. He took office on 29 May 1999.[1] After taking his seat in the Senate he was appointed Chairman of the committee on Tourism & Culture and a member of the committees on Ethics, Internal Affairs and Information.[2]