The head teacher of St George's School says it is oversubscribed
About 400 parents, teachers and pupils have packed a drop-in session to urge councillors not to close their school.
Dorset County Council is proposing an overhaul of education in Purbeck by introducing a two-tier structure.
The authority says it has a surplus of 1,000 places and must close schools, which may include St George's first school in Langton Matravers.
Head teacher Anita Brown said the Church of England school was a huge part of the community.
She said: "This school is oversubscribed and was rated as good in its last Ofsted inspection.
"It is a hub of the community and a special part of the village.
"The hall has been packed today by people who want their voices heard and we hope our school is saved."
Dorset County Council stressed no final decision had been made on any school closures.
A spokesman said: "The drop-in sessions are currently being held to allow members of these communities discuss how they think the two-tier system could best meet local needs.
"These points are being fed into forums... and will be considered when looking at new options for these communities."
The drop-in sessions will run across the area until early October.
Councillors will make a final decision on the future of schools in Purbeck in July 2010.