It came after a trying first season in 2020, with Mouzouris' first Triple Eight campaign limited to just three rounds due to the effects of the COVID-19 pandemic.
"I didn't think this was going to happen today," Mouzouris beamed.
"I'm speechless. It's awesome.
"That's a great way to start the year, a pole for Triple Eight and a pole for me."
On Friday, Mouzouris was sixth in Practice 1, before dropping to 12th in the second session.
However, he returned on Saturday to drop his #10 pitbox.io VF Commodore into P1 for the first time.
"We had a real battle yesterday in practice with no brakes, so I wasn't sure how this session was going to play out," he said.
"It's a great reward for the team."
Mouzouris will start from pole for Race 1 at the Repco Mt Panorama 500 at 1:40pm AEDT.
This weekend’s event will be broadcast live on Foxtel and the Seven Network, and will be streamed on Kayo. Check out the full TV schedule here.
Sign up to the Repco Supercars Championship Newsletter
We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok