An online petition calling for the principal of Kildare Catholic College to be re-instated has amassed almost 800 signatures in under a day.
Meanwhile, a Facebook page in support of Rod Whelan has reached over 1800 followers.
The page is calling for parents to take their concerns directly to Christopher Prowse, the Archbishop of the Canberra and Goulburn diocese.
Parent-of-two at the school Frank Goodyer is among the many who have written to the office of the Archbishop.
Having spoken with other parents in his position, Mr Goodyer estimates that the Archbishop "must have been inundated by now" with letters and emails from the Wagga community.
Mr Goodyer's letter, dated Monday, reads: "By the time you read this letter you will no doubt have experienced a significant groundswell of support for Rod Whelan and his leadership by not only the Kildare Catholic College community but by the wider Wagga Wagga and Riverina community."
The development follows demonstrations by the student population on Monday morning.
School board member Bill Wood, supported his children's participation and commended the senior students leading the charge.
"Those year 12 kids were instrumental in the protest, they brought the students down to the oval, and then when it was over they also led them back to class," he said.
"You couldn't be prouder of that behaviour, what we're dealing with is a really responsible and respectful group of students who genuinely value their education.
"That speaks volumes about the kind of culture Rod Whelan has built there."
The principal's absence from the school was originally announced via an email to parents on August 14.
Mark MacLean, the director of schools at the Catholic Education Diocese of Wagga Wagga, confirmed on Monday that Mr Whelan would not be returning to the school after having "tended his resignation citing personal issues".
The role of acting principal will be taken by Christie Scoble, while Alison Sutton remains in her capacity as the assistant principal.
Yesterday, Mr MacLean said students would be offered counselling following the shock announcement.
But with the HSC due to begin in a month, parents and students have questioned the timing.
"It's as if they were hoping for us to move on, nothing to see here," Mr Goodyer said.
"But you've got disruption to the classroom, you've got teachers now removed from the classroom.
"That's going to disturb preparation for the HSC, and it might even mean applications need to be made at a state level for [exam] extensions."