The Catholic Education Office is warning parents not to vote for the Greens in four inner-city seats the party hope to win.

The Catholic Education Office has intervened in the state election, warning parents not to vote for the Greens in four inner-city seats.

In a letter sent to 5500 families in the electorates of Melbourne, Brunswick, Richmond and Prahran ahead of Saturday's state election, Catholic Education Office Melbourne executive director Stephen Elder said the Greens' education policy was likely to "adversely affect" Catholic schools.

He said the Greens' policy did not distinguish between Catholic and other non-government schools, which could lead to fee increases and make it harder to accommodate disadvantaged students.

"We are most concerned that the need of a school community could be measured through the value of its land and not the needs of its students," he said.

Mr Elder said Coalition and Labor commitments- including linking funding for Catholic education to 25 per cent of government school costs and $120 million over four years for new non-government school buildings and upgrades- would be put at risk if the Greens held the balance of power.

The Greens are investing a lot of resources in Melbourne, where they need a 4.7 per cent swing to pinch the seat off Labor MP Jennifer Kanis.

Ms Kanis said the Greens had failed to address the pressing issue of funding for Catholic schools, which educate many students from migrant and low-income families.

"Those kids deserve a quality education and investment in our system. As a Labor member for Melbourne I will be able to achieve much more for my constituents compared to an inexperienced commentator on the sidelines."

Victorian Greens leader Greg Barber described the letters as "a last-minute scare campaign not based on any evidence."

But Labor has also drawn the ire of the Catholic community, high profile religious leaders last week decrying a proposal by Labor, backed by the Greens, to amend equal opportunity laws to make it harder for schools to hire staff based on religious background or sexual orientation.

The principal of the non-religious Fitzroy Community School, Timothy Berryman, has also spoken out against the Labor's proposed changes in a letter to parents, saying the key issue of the state election was "the ability of like-minded people to choose to educate their children as they feel appropriate".

Mr Berryman told Fairfax Media the proposal was a "direct attack on multiculturalism" and that imparting values was the primary role of a teacher.

"It's not the role of an industrial tribunal to say schools can't impart [their] values," he said.

"I see it as demeaning to teachers. If our values aren't a part of what we do, we're becoming robots".

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