Ipswich and South Suffolk or greater Ipswich will be a unitary authority area in the ceremonial county of Suffolk, England. It will be formed from the Ipswich district, 31 parishes from Babergh, 8 parishes from Mid Suffolk and 25 from East Suffolk. The alternative proposal for a single unitary council was not chosen. There will be elections in May 2027 and the new unitary will be created in 2028. The current district of Ipswich is currently unparished but there are plans to set up a town council, the rest of the future district is parished. In 2021 the population of the area was 252,552. The largest settlement in the district is the county town of Ipswich, other towns include Felixstowe, Kesgrave and Hadleigh. Despite being part of the Ipswich built-up area in the 2011 census (but not 2001 census) the town of Woodbridge is planned to be in Central and Eastern Suffolk rather than the "Ipswich and South Suffolk" unitary, it has been suggested that this could be because the people of Woodbridge strongly opposed to being linked with Ipswich.
In 2008 there was a similar proposal for a "North Haven" unitary authority covering Ipswich and Felixstowe and either a single "Rural Suffolk" or a split of the rest of Suffolk into eastern and western unitaries. In 2007 there was a proposal for Ipswich alone to become a unitary authority. Before 1974 Ipswich was a county borough.
Other than the Ipswich unparished area, the district will be entirely parished. It will contain the following civil parishes:
The local authority will be Ipswich and South Suffolk Council. The first councillors will be elected in the 2027 Ipswich and South Suffolk Council election.