The SPA Way's education division has been asked to run a high profile campaign targeting the national press to promote the benefits of the teaching method.
The Montessori teaching method is usually with younger children and allows children more freedom to direct their own development.
Currently, there are nearly 700 Montessori primary schools and nurseries across the UK and nearly 300 new Montessori teachers train every year.
The charity is hoping to significantly increase these figures as a result of its campaign.
According to the charity, the method is traditionally viewed as a technique for 'posh tots'.
The charity's campaign message will centre around making it accessible to a wider range of children.
'Time and again the positive results of the Montessori teaching method are evident and we see no reason why these should be exclusively available to those who can afford private education,' said Montessori CEO Philip Bujak. 'In the words of M&S, it should be "exclusively for everyone",' he added.
The SPA Way's associate director Melanie Diamond will lead the account.
The charity wants every primary school across the country to have a Montessoritrained specialist on staff within the next ten years.