Keith Griffiths takes up the post after serving as acting chief executive for the last six months.
Just prior to local government reorganisation, in 1996, Mr Griffiths worked for Cynon Valley BC, as its deputy director of finance and housing, after first joining the authority as a trainee accountant in 1974.
Council leader Russell Roberts said:
'Keith is very well placed to take up the challenge of the new chief executive of Rhondda Cynon Taf.
'He has a wealth of experience to bring to the role, he knows the area, the people and the challenges we face, better than anyone. We are delighted to that Keith has accepted the post. He has done a marvellous job as acting chief executive for the last six months, my cabinet and I look forward to working with Keith in the future to work towards the council's key priorities.'
Mr Griffiths said:
'I am absolutely thrilled to have been chosen as Rhondda Cynon Taf's next chief executive. Our council is already making real improvements to the quality of all its services.
'My immediate focus will be to work closely with our elected members to ensure we build on the progress we have made and to do everything we possibly can to enhance the quality of life of every single one of the county borough's residents.'
* Rhondda Cynon Taf Council is the second largest local authority in Wales with a total of over 231,000 residents.