Scott Mitchell was born in London and grew up in Hove, Sussex. He moved back to London at 25, studying for 3 years as an actor. After graduating and taking on various TV and theatre roles, Scott met his future wife, actress Dame Barbara Windsor, who he shared his life with for 27 years, before she passed away in 2020.

In 2014, Barbara was given the devastating news that she had been diagnosed with Alzheimer's, a day that would change both hers and Scott's lives forever. Although initially kept private, Scott and Barbara went public with the news in 2018. In 2019 Scott entered the London Marathon with a team of Barbara's friends, alongside charity campaign The Dementia Revolution, to raise vital funds for dementia research. To date it is the record-breaking charity partner for the London Marathon, raising over £4 million. Scott also ran the 2021 marathon to raise money for Alzheimer's Research UK, a charity he is now an ambassador for.