Teachers, firefighters and council workers from across Wiltshire will meet at County Hall today as part of a coordinated day of strike action.
The Unison union has organised a rally in Trowbridge at 10.30am, where they will be joined by members of the GMB, PCS and Unite to protest over pay offers.
Sue Anderson, Wiltshire Unison branch secretary, said: “Our members are finding it difficult to manage personal finances and many are struggling to survive.
“It is never easy for members to take strike action, and it is always a last resort, but they feel very strongly about this and we are expecting a good turnout at the rally.”
The National Union of Teachers will also be striking over pay and workloads, with primary and secondary schools across the county expecting to be disrupted.
In west Wiltshire, St Laurence School in Bradford on Avon is partially closed, but other secondaries remain open.
In north Wiltshire, The Corsham School is closed to all non-sixth form students, while Devizes School and Hardenhuish School in Chippenham will be partially closed. Malmesbury School will be open as normal, but students are warned to expect disruption to planned lessons. All other north Wiltshire schools are due to open as usual.
Members of the Fire Brigades Union will also join fellow public sector workers at the rally, with fire stations in Trowbridge, Warminster and Melksham are expected to close. Wiltshire Fire and Rescue Service expects to have contingency plans in place to cover any emergencies.