The table below lists Nigerian senators of the 4th National Assembly.
The 4th National Assembly (1999–2003) was inaugurated on 29 May 1999 at the start of the Nigerian Fourth Republic.
Evan Enwerem was appointed president of the Senate, until he was removed from office on 18 November 1999, replaced by Chuba Okadigbo.
He was elected unopposed on the platform of the PDP when the previous winner, Uche Nnaji of AD stepped down before the inauguration of the 4th Senate in 1999.
The bye election that followed Uche Nnaji's withdrawal paved the way for Jim Nwobodo to be elected unopposed on the platform of The Peoples Democratic Party (PDP).