The second election to Rhondda Cynon Taf County Borough Council was held on 6 May 1999.
An additional seat was created in the Pontyclun ward while the Rhydfelen Lower ward was abolished.
Plaid Cymru won control of the authority from Labour.
[2] Roberts had been elected as a Residents' candidate in 1995 An additional seat was created in this ward.
Thorngate had been elected as a Labour candidate in 1995.