Caerphilly County Borough Council () is the local authority for the county borough of Caerphilly, one of the principal areas of Wales. The last full council elections took place 5 May 2022.
The council was former in April 1996 following the Local Government (Wales) Act 1994 by merging Islwyn Borough Council and the Rhymney Valley District Council.
In September 2025, Sean Morgan resigned from Welsh Labour and hence leader of the council in order to back Plaid Cymru in the 2025 Caerphilly by-election.
The council has been under Labour majority control since 2012.
The first election to the new council was held in 1995. It initially operated as a shadow authority alongside the outgoing authorities before coming into its powers on 1 April 1996. Political control of the council since 1996 has been as follows:
The role of Mayor of Caerphilly is largely ceremonial. Political leadership is instead provided by the leader of the council. The first leader, Graham Court, was the last leader of the old Rhymney Valley District Council. The leaders of Caerphilly County Borough Council since 1996 have been:
Following the 2022 election, and subsequent by-elections and changes of allegiance up to February 2026, the composition of the council was:
The next election is due in 2027.
Party with the most elected councillors in bold. Coalition agreements in notes column
The council inherited two main offices from its predecessor authorities: Ystrad Fawr House at Ystrad Mynach from Rhymney Valley District Council, and Pontllanfraith House in Pontllanfraith from Islwyn Borough Council. Ystrad Fawr House was demolished in 2008 to make way for the Ysbyty Ystrad Fawr hospital. A new headquarters was built at Penallta House in the Tredomen area of Ystrad Mynach (in the community of Gelligaer), opening in April 2008. The other office at Pontllanfraith House subsequently closed in 2015 and has since been demolished.
The county borough is divided into 30 electoral wards returning 69 councillors. Many of these wards are coterminous with communities (parishes) of the same name. The following table lists council wards, communities and community ward areas.
Until 2022, the county borough was divided into 33 electoral wards returning 73 councillors. Communities with a community council are indicated with a '*':
In 2015 Anthony O'Sullivan, the chief executive and two other executives were charged with misconduct during public office. It was alleged that they specifically 'wilfully misconducted themselves in relation to securing Caerphilly County Borough Council's approval of a remuneration package for the said council's chief officers from which they stood to gain for themselves'.
Relating to this and other failings the Welsh Assembly commissioned a special report on the council in January 2014.