Maison Plein Coeur has been receiving funding from the federal government for the last 20 years, but it will be cut come April.
They will be receiving $100,000 less — 20% of its budget — which will impact their services.
The organization offers services for Montrealers living with HIV such as psychological support, learning workshops, and social reintegration following their diagnosis.
"It's funding that supports several of our programs, that pays for certain portions of our salaries as well," said Chris Lau, director general of Maison Plein Coeur. "So, it's pretty major."
The federal government is allocating more funding towards the prevention of HIV, which leaves less for support organizations.
"We sort of feel like we're being left in the dust," he said. "We're trying to manage the needs of the community with less support from our government."
Laud said though there is less urgency when it comes to HIV because it is progress, the needs are still there.
He said they are doing everything they can to minimize the impact in April, so that people can continue using their services as usual.
They are looking for more donors and publicly fundraising.
The organization started a campaign in early December.
"We set a campaign goal of $20,000 and we're close to reaching half of that already in one month," Lau said.
The Maison Plein Coeur's fundraising will continue for another six weeks.
-CJAD 800's Alyssia Rubertucci contributed to this report.