The Victorian Catholic Education Office has sent letters to parents at Catholic schools in Melbourne's inner city, advising they should not vote for the Greens in Saturday's election.

The letters were circulated in seats where the Greens are expected to poll well - Melbourne, Brunswick, Richmond and Prahran - and questioned the Greens' commitment to funding Catholic schools if the party held the balance of power.

In the letter, executive director Stephen Elder said while both the Labor and Liberal parties would legislate on funding arrangements for the first time, the Greens wanted to create a body to determine whether the schools deserved any money.

"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," Mr Elder wrote.

"The Greens do not distinguish between Catholic schools and other non-government schools.

"This approach is likely to adversely affect many Catholic schools."

Victorian Greens leader Greg Barber said the party had always stood for increased education funding based on equity and the needs of students.

"It's a last-minute scare campaign, there'll be a few more of those, they're not based on fact," Mr Barber said.

"But if you look at education, everybody from community-based childcare to the tertiary education union has given the Greens top marks for our education policies."

The Catholic Education Office told the ABC the letter was sent to principals on Wednesday and most likely distributed to about 5,000 families on Thursday.

The two major parties have said funding for Catholic schools would be linked to the cost of educating a student at a government school, which Mr Elder said would alleviate the need to increase fees.

The parties have also dedicated $120 million for facility and building upgrades at Catholic schools.

Mr Elder said he wrote to the Greens earlier this year about the issue and said the party was "non-committal".

"With such little detail, I am very concerned about the threat of fee increases for parents like yourself and whether Catholic schools would struggle to welcome disadvantaged students and their families," the letter said.

"There is a chance the Greens could hold the balance of power in the Victorian Parliament, which could put the commitments from the major parties at risk.

"When you go to the ballot box this Saturday, and you balance what's really important to you, please remember that both Labor and the Liberals are committed to secure, ongoing and community-building funding for local Catholic schools like yours."

The Labor MP for Melbourne, Jennifer Kanis, said she did not know if it would affect voting.

"I don't know whether it will hurt or harm me," she said.

"What I'm looking at is delivering for families in Melbourne and this is one of the many pressing issues the Greens have failed to address in their campaign."

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