- Source of Wealth: Television, Radio
- Age: 46
- Birth Place: Colchester, Essex, England
- Height: 5′ 9″ (1.75 m)
- Marital Status: Married (Dee Koppang )
- Full Name: Seán Dermot Fintan O’Leary, Jr.
- Nationality: British
- Date of Birth: May 24, 1973
- Ethnicity: Irish, English
- Occupation: TV and Radio Presenter
- Education: Middlesex University, St Benedict’s Catholic College
- Children: None
Born to both Irish parents, Dermot O’Leary went to Middlesex University to pursue a degree in Media and Television with Politics. Starting out as a disc jockey, he has become a successful TV and radio presenter.
In 2012, Dermot O’Leary is estimated to be worth $4 million.