The custom-built, $26,5000 all terrain vehicle was found abandoned in a parking lot after it was stolen along with its trailer last week, Radio France Internationale reported.
The driver of a bus for handicapped persons found the wheelchair but didn't know who it belonged to until hearing news reports about the theft.
"After he saw the story on TF1 (news broadcast), a man called me on the telephone," the French quadruple amputee said. "Thank you to the Internet users, you were incredible ... thank you to the media."
Croizon is best known for swimming the English Channel in 2010.