A co-ed Catholic primary school in Melbourne’s southeast has introduced a “no socialising” rule between students of the opposite sex, according to reports.

Parents claim Don Bosco Catholic Primary School in Narre Warren didn’t inform them of the rule change, which bans year five and six students from gathering in co-ed groups in the playground.

The new rules were announced at an emergency assembly on Wednesday but parents have labelled it “sexist”, according to News Corp.

One parent said he had to find out about the rule change from his 11-year-old boy.

View photos A stock photo of students playing at school. The rules were reportedly brought in after an emergency meeting.Source: AAP More

“He told us that the senior school students weren’t allowed to gather in groups with the other gender at recess or lunchtime anymore,” the parent told Neil Mitchell on 3AW.

It’s believed the rule was introduced because some senior students have broken “school guidelines”.

A parent, who did not wish to be named, said angry parents had spoken to the school principal.

The school has been contacted for comment.