Corpus Christi Catholic School in Boscombe is one of 10 primary schools earmarked to take extra pupils to cope with extra demand for places.
The school in St James's Square, off Parkwood Road, could take up to 30 pupils under plans announced by Bournemouth Borough Council.
The council says it needs a further eight reception classes next year because of a record rise in the birth rate in the borough.
The council is also considering creating a new primary school to cope with a predicted future increase in pupil numbers.
Neil Goddard, service director for children’s strategic services, said: "This is an issue facing not only us, but the UK as a whole, and urban areas in particular. Pupil numbers are increasing across Bournemouth with particular pressure on the centre and south east of the borough."