Cambridgeshire County Council is the county council for non-metropolitan county of Cambridgeshire, England. The non-metropolitan county is smaller than the ceremonial county, which additionally includes the City of Peterborough. The county council consists of 61 councillors, representing 59 electoral divisions. The council is based at New Shire Hall in Alconbury Weald, near Huntingdon. It is part of the East of England Local Government Association and a constituent member of the Cambridgeshire and Peterborough Combined Authority.

Since May 2025, it has been run by a majority administration of Liberal Democrats.

Cambridgeshire County Council was first formed in 1889 as a result of the Local Government Act 1888 as one of two county councils covering Cambridgeshire; the other was the Isle of Ely County Council. In 1965, the two councils were merged to form Cambridgeshire and Isle of Ely County Council.

This arrangement lasted until 1974, when, following the Local Government Act 1972, Cambridgeshire and the Isle of Ely were merged with Huntingdon and Peterborough to form a new non-metropolitan county of Cambridgeshire under the control of a newly constituted Cambridgeshire County Council. The first elections to the new authority were in April 1973, and the council took office on 1 April 1974.

From its re-creation in 1974 until 1998, the county council administered the entire county of Cambridgeshire. In 1998, Peterborough City Council became a unitary authority, thus outside the area of the county council. For ceremonial, geographic, and certain administrative purposes, however, Peterborough continues to be associated with and work in collaboration with Cambridgeshire County Council. Since 2017, the council has been a constituent member of the Cambridgeshire and Peterborough Combined Authority, led by the directly-elected Mayor of Cambridgeshire and Peterborough.

The council is responsible for public services such as education, transport, highways, heritage, social care, libraries, trading standards, and waste management.

The county council is the upper-tier of local government, below which are five councils with responsibility for local services such as housing, planning applications, licensing, council tax collection and rubbish collection. This arrangement will be replaced with unitary authorities after Local Government Reorganisation in 2027-28. The districts of Cambridgeshire are:

Following the 2025 Cambridgeshire County Council election the Liberal Democrats won a majority of the council's seats. They sit in a majority political group with an Independent councillor.