Gelatissimo will on Saturday donate $1 from every scoop sold to the Vinnies Bushfire Appeal, with up to $50,000 hoped to be raised on the day across its 48 stores.
Canberra has three stores - on Flinders Way in Manuka, in the Marketplace Gungahlin and in the Canberra Centre in Civic.
Gelatissimo CEO Filipe Barbosa said the company had already donated $50,000.
"We choose Vinnies as 100 per cent of funds raised will go directly to helping Aussie families and communities both with immediate assistance and with long term support, helping to rebuild communities on what is set to be a long road to recovery," he said.
"Every dollar counts. As an Aussie-owned brand that prides itself on bringing happiness to people's lives, it's the least we could do to support those who have been affected by these devastating bushfires."