 | Simon Pegg als Sidney Young |
 | Kirsten Dunst als Alison Olsen |
 | Danny Huston als Lawrence Maddox |
 | Megan Fox als Sophie Maes |
 | Jeff Bridges als Clayton Harding |
 | Gillian Anderson als Eleanor Johnson |
 | Max Minghella als Vincent Lepak |
 | Jefferson Mays als Bill Nathanson |
 | Bill Paterson als Richard Young |
 | Miriam Margolyes als Mrs. Kowalski |
 | Kelan Pannell als Young Sidney |
 | Janette Scott als Sidney's Mother |
| Kelly Jo Charge als Apollo Awards Presenter |
| Christian Maier Smith als Apollo Awards Guest |
 | Katherine Parkinson als PR Woman |
 | Felicity Montagu als Clipboard Nazi |
 | Thandiwe Newton als Self |
 | John Lightbody als Assistant Hotel Manager |
 | Ian Bonar als Post Modern Review Staff |
 | James Corden als Post Modern Review Staff |
 | Fenella Woolgar als Post Modern Review Staff |
 | Chris O'Dowd als Post Modern Review Staff |
| Hugh Thompson als Post Modern Review Staff |
| Emily Thorling als Post Modern Review Staff |
 | Miquel Brown als Clayton's Assistant |
 | Nathalie Cox als Woman in Bar |
 | Sam Douglas als Barman |
 | Charlotte Devaney als Bobbie |
| Gillian King als Sharps Assistant |
 | Margo Stilley als Ingrid |
| Isabella Calthorpe als Anna |
 | Hannah Waddingham als Elizabeth Maddox |
 | Diana Kent als Rachel Petkoff |
| Emily Denniston als Maddox's Assistant |
 | Ashley Madekwe als Vicky |
| Lisa McAllister als Sophie Maes' Assistant |
| Julia West als Mother Superior – Trailer |
| Brona C. Titley als Nun – Trailer |
| Charles de Bromhead als Young Priest – Trailer |
 | Jane Perry als Mrs. Harding |
| Connie Wheeler als Harding Child |
| Lara Edmunds als Harding Child |
| Allen Lidkey als July 4th Party Guest |
 | Robert B. Weide als July 4th Party Guest |
 | Nathan Nolan als July 4th Party Waiter |
 | Andy Lucas als Wizard Dentist |
| Alexandra Aitken als Nightclub Girl |
| Sarah Mennell als Flight Desk Attendant |
| Liat Baruch als Couple on Blanket |
| Eivind Karlsen als Couple on Blanket |
 | Brian Austin Green als Party Guest (uncredited) |
 | Toni Collette als Self (uncredited) |
 | Daniel Craig als Self (uncredited) |
 | Ricky Gervais als Self (uncredited) |
 | Kate Winslet als Self (uncredited) |
| Edward Lemont als Sharps Magazine Receptionist (uncredited) |
 | Dennis Jay Funny als Office Lobby Concierge (uncredited) |
 | Elli als Newsstand Vendor (uncredited) |
| Jemma Bolt als Sharps Girl (uncredited) |
 | Forbes KB als Hotel Security (uncredited) |
| James Schram als Doorman / Bouncer (uncredited) |
| Mitchell Green als Bouncer (uncredited) |
| Cris Blanco als Night Club Patron / Party Goer (uncredited) |
| Tracy Redington als Model (uncredited) |
| Giada Dobrzenska als Fashion Party Girl (uncredited) |
| Oliver Martin als Maddox's Friend at Party (uncredited) |
 | Davide Petrucci als Guest at Party (uncredited) |
 | Ashton Swinford als Glamorati (uncredited) |
| Thor Knai als Sharps Party Celebrity (uncredited) |
| Debbie Attwell als Red Carpet Fan (uncredited) |
| Robert Stone als BAFTA Security (uncredited) |
| Michael Berendt als Award Winner (uncredited) |
| Paul White | Executive Producer |
| Tessa Ross | Executive Producer |
| Richard Hewitt | Line Producer |
| Robert B. Weide | Director |
| Simon Fawcett | Executive Producer |
| Robin O'Hara | Producer |
| Toby Young | Producer |
| Norman Merry | Executive Producer |
| Peter Hampden | Executive Producer |
| Gary Smith | Executive Producer |
| Peter Straughan | Screenplay |
| Brian Gilmore | Executive Producer |
| Carrie Fix | Line Producer |
| Elizabeth Karlsen | Producer |
| Stephen Woolley | Producer |
| Jon Diamond | Executive Producer |
| Kim Davis-Wagner | Casting |
| Justine Arteta | Casting |
| David Arnold | Original Music Composer |
| John Beard | Production Design |
| Lila Yacoub | Line Producer |
| Jina Jay | Casting |
| Oliver Stapleton | Director of Photography |
| Jimmy Price | Line Producer |
| David Freeman | Editor |
| Laurie Borg | Co-Producer |
| Annie Hardinge | Costume Design |
| Anthony Gasparro | Art Direction |
| Sara Parks | Set Decoration |
| Beverly Winston | Script Supervisor |
| Jo Fernihough | Unit Publicist |
| Ray Chan | Supervising Art Director |
| Ray Fisher | Leadman |
| Matthew Penry-Davey | First Assistant Director |
| Toby Young | Script Consultant |
| Toby Young | Book |
| Tony Clarkson | Location Manager |
| Neil Chaplin | Production Accountant |
| Polly Duval | Post Production Supervisor |
| Jim Greenhorn | Sound Mixer |
| Glenn Freemantle | Supervising Sound Editor |
| Pete Cavaciuti | Steadicam Operator |
| John Jordan | Focus Puller |
| Ryan Taggart | Loader |
| Robert Hamilton | Video Assist Operator |
| Andrew Jones | Camera Trainee |
| Rupert Lloyd-Parry | Key Grip |
| Orin Beaton | Boom Operator |
| Nadine Richardson | Sound Assistant |
| Lance Roehrig | Second Assistant Director |
| Simon Downes | Second Second Assistant Director |
| Charlie Reed | Third Assistant Director |
| Sam Haveland | Floor Runner |
| Philip James Booth | Stand In |
| Hannah Andrews | Stand In |
| Francesca Dowd | Production Coordinator |
| Hollie Foster | Assistant Production Coordinator |
| Ella Harris | Production Runner |
| Sarah Stiff | Assistant Accountant |
| Susan Chika Anisiobi | Assistant Accountant |
| Joanna Laurie | Producer's Assistant |
| Liat Baruch | Actor's Assistant |
| Peter Ogunsalu | Producer's Assistant |
| Loyd Catlett | Actor's Assistant |
| Robin Davies | Producer's Assistant |
| Jo McLaren | Stunt Double |
