football club boss - a regular guest on talkSPORT - will be accompanied by former banker Jenny Campbell as the newcomers, replacing Nick Jenkins and Sarah Willingham in the series airing later this summer.
Budding entrepreneurs will vie for their financial investment as well as potential support running their businesses.
Parish said: "I'm thrilled to become a dragon and really excited to meet the entrepreneurs in this series, see what ideas they bring to the den and how I might be able to help them grow."
Fans have been reacting to the surprise news, with one fan even reading 'Parish' and 'Den' in the same sentence and thinking their chairman was taking over at south London rivals Millwall.