The second election to Neath Port Talbot County Borough Council was held on 6 May 1999. It was preceded by the 1995 election and followed by the 2004 election. On the same day there were elections to the other 21 local authorities in Wales and community councils in Wales.
All council seats were up for election. These were the second elections held following local government reorganisation.
Most sitting members of West Glamorgan County council sought election to the new authority. A number were also members of the previous district councils but others contested a ward against a sitting district councillor.
Former Communist Glaslyn Morgan was elected as Democratic Left candidate in 1995 but subsequently joined Plaid Cymru.
Plaid Cymru won the seat in 1995 but lost it at a subsequent by-election.
Clive Thomas had captured a seat from Labour at a by-election.
Patricia Jane Thomas had held the seat in a by-election since 1995.