Almost one in three state funded primary schools does not have any male classroom teachers, a study suggests.
Rutland in the East Midlands has the highest proportion of primary schools without any male teachers - 52.9%.
The Warwick Business School report says the proportion of schools without a male classroom teacher has increased over the last 12 months.
The report's author said they believed a lack of male teachers was bad for pupils.
Dr Joshua Fullard, assistant professor of behavioural science at Warwick Business School, said: "Worryingly, the decline in the number of male classroom teachers is getting worse.
"This has an impact on the education that children receive. There is a large body of research that shows students benefit from being educated by a teacher with certain similarities to them.
"Boys from less affluent backgrounds are already the lowest achievers in school. They are the students who would benefit most from a male teacher, but they are less and less likely to have one.
