Cefin Arthur Campbell (born June 1958) is a Welsh Plaid Cymru politician who has been Member of the Senedd (MS) for Mid and West Wales region since 2021.

[3] In 2008 Campbell started Sbectrwm consulting firm specializing in research, strategic planning, project management and training.

[2][3] He was elected as a Carmarthenshire county Councillor for Llanfihangel Aberbythych in 2012, and again in 2017 when he became Executive Board member for Communities and Rural Affairs.

[4][2] As an Executive Board member he chaired a cross-party group that developed a comprehensive strategy to promote the Welsh language within the Council, a strategy to regenerate rural Carmarthenshire, an innovative plan to tackle poverty, an action plan to ensure that Carmarthenshire reaches net zero carbon by 2035 and produced a report to tackle racism and discrimination.

[3] In January 2022, Cefin Campbell was announced as one of Plaid Cymru's Designated Members as part of the party's Co-operation Agreement with the Welsh Government.