Around 60 bus drivers from First Hampshire and Dorset will strike this Monday, after their pay fell way below their colleagues in other regions.
The strike will cause disruption for passengers and school children in the Bridport, Portland and Weymouth areas.
The drivers, who are on £8.30 an hour, are in disputes over pay as their colleagues on Yellow Buses in Bournemouth, are on more than £10 an hour.
Management have offered a 1.5% rise from April 2013 for a year which would take their pay to £8.50.
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Wednesday morning's weather for the west of the region
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