"As a person who is well known in the local community and throughout the nation, he should know better."
The fan took a picture of Mitchell's black Holden in the space.
Read more: Me and my car - Ben Mitchell
Mitchell admitted the indiscretion in a statement sent to the Herald by South Pacific Pictures last night.
"I did park in a reserved park when I was in a hurry on Saturday morning," he said.
"Although there were plenty of empty disabled spaces available at the time, I absolutely acknowledge that there are many who are far more deserving of those parks than me. Not my finest moment."
Mitchell has a history of getting into trouble in his Holden, which he spoke about in an interview with the Herald in October 2013.
"It's powerful. And it looks good. It suits me," he said.
Soon after, Mitchell lost his licence because of excess demerit points. Then, in December he was caught driving while his licence was suspended and had six months added to his suspension.