Parents of pupils at Chillerton and Rookley primary are refusing to move their children to a different school, despite a council warning that there'll be no one there to teach them.
The local authority has written to parents urging them to seek alternative education, after the last remaining teacher announced they were leaving.
Currently there are only ten students on the books, across three year groups.
Campaign group Save our School has said "it is for parents to decide where their children are educated", not the council.
It said some parents will not move their children, citing their rights under Section 9 of the Education Act.
One parent of a child at the school said:
“We absolutely must keep the school open.
"If it means staff training, promotions and moving around staff then it needs to be done.
“I know that my child will not be able to go to any other school as it will affect her mental health and to be honest she shouldn’t have to be pressured.”
A spokesperson for the Save our School Group said:
"Parents at rural schools must be looking over their shoulders wondering who is next. We would like to understand exactly what the Council has done before ‘running out of options’.
"We would recommend reinstating provision on site for starters.”
The Isle of Wight Council has said it has a legal obligation to ensure children receive a suitable education.
It is offering free home-to-school transport to students who choose to move to nearby Godshill primary.
Councillor for education, Debbie Andre, said:
"We certainly did not want to be in this position, but we have run out of options as things currently stand and it's with a very heavy heart that we have had to take this decision."
Chillerton and Rookley, which was rated as 'Good' by Ofsted in July, has already survived the threat of closure this year.
Rising costs and falling pupil numbers were blamed at the time, as previously reported.