| Year | Title | Role | Notes |
| 1997 | Timmy Towers | Merlin | 1 episode |
| 1998–2002 | CITV | Presenter | Presenter during studio segments in between children's programmes shown during afternoons on ITV |
| 1999–2004 | The Quick Trick Show | 5 series |
| 2000–2004 | Finger Tips | Co-presenter | With Fearne Cotton and Naomi Wilkinson |
| 2002–2003 | Brilliant Creatures | Presenter | |
| 2003 | You Can Do Magic | |
| SMTV Live | |
| 2003–2004 | Globo Loco | |
| 2004 | Junior Eurovision Song Contest: The British Final | Co-presenter | With Holly Willoughby and Michael Underwood |
| 2004–2006 | Holly & Stephen's Saturday Showdown | With Holly Willoughby |
| 2005 | Stars in Their Eyes | Himself | Performer; 2 episodes |
| 2005–2006, 2010 | Tricky TV | Presenter | 3 series |
| 2006–2007 | Dancing on Ice: Defrosted | |
| 2007–2019 | Britain's Got More Talent | 13 series |
| 2007–2011 | Animals Do the Funniest Things | 15 episodes |
| 2009 | All Star Impression Show | |
| Anonymous | 1 series |
| 2010 | Magic Numbers |
| The 5 O'Clock Show | Co-presenter | With Kimberly Walsh |
| 2010–2013 | Celebrity Juice | Himself | Guest; 3 episodes |
| 2010, 2015 | Coronation Street Uncovered: Live | Presenter | 2 episodes |
| 2011 | Born to Shine | Guest judge | 1 episode |
| 2011–2014 | This Morning's Hub | Presenter | Regular |
| 2011–present | The Big Quiz | 7 episodes |
| 2012 | Emmerdale Live – The Fallout | Television special |
| All Star Mr & Mrs: Text Santa Special | Television charity special |
| 2012–2013 | This Morning | Guest presenter | 4 episodes |
| 2013 | The Paul O'Grady Show | 1 episode |
| Sunday Side Up | Presenter | 1 series |
| The Illusionists | Television special |
| 2013–2018 | Big Star's Little Star | 5 series |
| 2013–present | Catchphrase | 7 series |
| 2014 | Sunday Night at the Palladium | Guest presenter | 1 episode |
| 2015 | Get Your Act Together | Presenter | 1 series |
| Reality Bites |
| The Magic Show Story | Television special |
| The Saturday Night Story | Narrator | Two-part series |
| The Nation's Favourite Disney Song | Television special |
| Text Santa | Co-presenter | Christmas appeal show |
| Pick Me! | Presenter | 1 series |
| 2015–2018 | Through the Keyhole | Himself | 3 episodes |
| 2016 | Go for It | Presenter | |
| The Next Great Magician | Co-presenter | 1 series |
| 2016–2024 | Ant & Dec's Saturday Night Takeaway | Presenter | 'Ant vs Dec' and 'In for a Penny' segments |
| 2018 | Big Star's Bigger Star | 1 series |
| 2018—present | The National Lottery Draws | During advert breaks |
| 2019–2024 | In For a Penny | 6 series |
| 2020–2021 | Rolling In It | 2 series |
| The One Show | Guest presenter | 2 episodes |
