Filmography
| Year | Title | Role |
| 2024 | Luther: Never Too Much (2024) | Executive Producer |
| 2022 | Empire of Light (2022) | Mr. Ellis |
| 2022 | Squaring the Circle (The Story of Hipgnosis) (2022) | Producer |
| 2021 | Mothering Sunday | Mr. Niven |
| 2021 | Operation Mincemeat | Ewen Montagu |
| 2020 | The Secret Garden (2020) | Lord Archibald Craven |
| 2020 | Supernova (2021) | Sam |
| 2019 | 1917 (2019) | General Erinmore |
| 2018 | Mary Poppins Returns (2018) | Wilkins/Wolf |
| 2018 | The Mercy | Donald Crowhurst |
| 2018 | Mamma Mia! Here We Go Again | Harry Bright |
| 2018 | The Happy Prince | Reggie Turner |
| 2018 | Kursk | Commodore David Russell |
| 2017 | Kingsman: The Golden Circle | Harry Hart/Former Agent Galahad |
| 2016 | Bridget Jones's Baby | Mark |
| 2016 | Genius (2016) | Max Perkins |
| 2016 | Loving | Producer |
| 2015 | Kingsman: The Secret Service | Harry Hart |
| 2015 | Eye in the Sky | Producer |
| 2014 | Magic in the Moonlight | Stanley |
| 2014 | Before I Go to Sleep | Ben |
| 2013 | Devil's Knot | Ron Lax |
| 2013 | The Railway Man | Eric Lomax |
| 2012 | Stars in Shorts | Steve |
| 2012 | Arthur Newman | Wallace Avery/Arthur Newman. |
| 2011 | Tinker Tailor Soldier Spy | Bill Haydon |
| 2010 | Calle Mayor | Gus Leroy |
| 2010 | The King's Speech | King George VI |
| 2009 | Disney's A Christmas Carol | Fred |
| 2009 | Dorian Gray | Lord Henry Wotton |
| 2009 | A Single Man | George |
| 2009 | St Trinian's 2: The Legend of Fritton's Gold | Geoffrey Thwaites |
| 2008 | The Accidental Husband | Richard |
| 2008 | Mamma Mia! (2008) | Harry |
| 2008 | Easy Virtue (Luxury Seating) | Jim Whittaker |
| 2007 | The Last Legion | Aurelius |
| 2007 | Then She Found Me | Frank |
| 2007 | When Did You Last See Your Father? | Blake Morrison |
| 2007 | In Prison My Whole Life | Executive Producer |
| 2007 | St. Trinian's | Geoffrey Thwaites |
| 2005 | Nanny McPhee | Mr. Brown |
| 2005 | Where the Truth Lies | Vince Collins |
| 2004 | Trauma | Ben |
| 2004 | Bridget Jones: The Edge of Reason | Mark Darcy |
| 2003 | Hope Springs (2003) | Colin Ware |
| 2003 | What a Girl Wants | Lord Henry Dashwood |
| 2003 | Girl With a Pearl Earring | Johannes Vermeer |
| 2003 | Love Actually | Jamie Bennett |
| 2002 | The Importance of Being Earnest (2002) | Jack |
| 2001 | Bridget Jones's Diary | Mark Darcy |
| 2001 | Conspiracy | Dr. Wilhelm Stuckart |
| 2000 | Relative Values | Peter Ingleton |
| 1999 | My Life So Far | Edward Pettigrew |
| 1999 | The Turn of the Screw | Master |
| 1998 | Shakespeare in Love | Lord Wessex |
| 1997 | Fever Pitch | Paul Ashworth |
| 1996 | The English Patient | Geoffrey Clifton |
| 1995 | Circle of Friends | Simon Westward |
| 1990 | Wings of Fame | Brian Smith |
| 1989 | Apartment Zero | Adrian LeDuc |
| 1989 | Valmont | Valmont |
| 1987 | A Month In The Country | Tom Birkin |
| 1983 | 1919 | Young Alexander |
