Fatuosity

Here's a list of actors from Downton Abbey that I have seen on stage (Mostly London theatres)

This list is unfinished and may be modified from time to time

If you have your own list let me know and I will post a link here

001 - Robert Crawley, Earl of Grantham  - Hugh Bonneville  - US and Them — Hampstead Theatre (2003)
002 - Lady Sybil Crawley  - Jessica Brown Findlay  - Oresteia — Almeida Theatre (2015)
003 - Lady Edith Crawley  - Laura Carmichael  - Uncle Vanya — Vaudeville Theatre (2012)
004 - Charles Carson  - Jim Carter  - Fashion — Tricycle Theatre (1990)
005 - John Bates  - Brendan Coyle  - The Weir — Royal Court (1998)
006 - Baxter  - Raquel Cassidy  - Sunday Father — Hampstead Theatre (2003)
007 - Lady Mary Crawley  - Michelle Dockery  - The UN Inspector — Olivier Theatre (2005)
008 - Joseph Molesley  - Kevin Doyle  - A Midsummer Night's Dream — Barbican Theatre (1995)
009 - Anna Bates  - Joanne Froggatt  - The Knowledge — Bush Theatre (2011)
010 - Sarah O'Brien  - Siobhan Finneran  - On the Shore of the Wide World — Cottesloe Theatre (2005)
011 - Lady Rose MacClare  - Lily James  - The Seagull — Southwark Playhouse (2012)
012 - Tom Branson  - Allen Leech  - Ecstasy — Hampstead Theatre (2011)

013 - Bertie Pelham  - Harry Hadden-Paton  - Posh — Royal Court Theatre (2010)
014 - Mrs. Hughes  - Phyllis Logan  - Gaucho — Hampstead Theatre (1994)
015 - Gwen Dawson  - Rose Leslie  - Bedlam — Shakespeare's Globe (2010)
016 - Cora Crawley, Countess of Grantham  - Elizabeth McGovern  - The Misanthrope — Young Vic (1996)
017 - Daisy Mason / Daisy Robinson  - Sophie McShera  - The Entertainer — Garrick Theatre (2016)
018 - Mrs. Patmore  - Lesley Nicol  - The York Realist — Donmar Warehouse (2018)
019 - Violet Crawley, Dowager Countess of Grantham  - Maggie Smith  - Three Tall Women — Wyndhams Theatre (1995)
020 - Ethel Parks  - Amy Nuttall  - Noises Off — Old Vic (2011)
021 - Alfred Nugent  - Matt Milne  - Dangerous Corner — Richmond Theatre (2014)
022 - Matthew Crawley  - Dan Stevens  - The Vortex — Richmond Theatre (2008)
023 - Charles Blake  - Julian Ovenden  - King Lear — Barbican Theatre (1999)
024 - Dr. Clarkson  - David Robb  - Half the Picture — Tricycle Theatre (1994)
025 - Isobel Crawley  - Penelope Wilton  - The Cherry Orchard — Albery Theatre (1996)
026 - Ivy Stuart  - Cara Theobold  - London Wall — Finborough Theatre (2013)
027 - Duke of Crowborough  - Charlie Cox  - The Prince of Homburg — Donmar Warehouse (2010)
028 - Sir Anthony Strallan  - Robert Bathurst  - Alarms & Excursions — Globe/Gielgud Theatre (1998)
029 - Lady Rosamund Painswick  - Samantha Bond  - Three Tall Women — Wyndhams Theatre (1995)
030 - Stowell  - Alun Armstrong  - Death of a Salesman — Lyttelton Theatre (1996)
031 - Tim Drewe  - Andrew Scarborough  - Hamlet — Hackney Empire (1995)
032 - Spratt  - Jeremy Swift  - Peer Gynt — Olivier Theatre (1990)
033 - Taylor  - Lionel Guyett  - Julius Caesar — Barbican Theatre (1996)
034 - Judge  - Timothy Carlton  - Cause Celebre — Old Vic (2011)
035 - Nanny West  - Di Botcher  - Flesh and Blood — Hampstead Theatre (2000)
036 - Lord Sinderby  - James Faulkner  - A Patriot for Me — Barbican Theatre (1995)
037 - Nield  - Kenneth Bryans  - Henry IV part 1 — Barbican Theatre (2001)
038 - Mr. Finch  - Martin Walsh  - Hobson's Choice — Young Vic (2003)
039 - Lavinia Swire  - Zoe Boyle  - Six Degrees Of Separation — Old Vic (2010)
040 - Bill Molesley  - Bernard Gallagher  - Man of the Mode — Royal Court (1994)
041 - Jane Moorsum  - Clare Calbraith  - Hangover Square — Finborough Theatre (2008)
042 - Man at Smithy  - Colin R. Campbell  - The Trackers of Oxyrhynchus — Olivier Theatre (1990)
043 - Terence Margadale  - Edward Baker-Duly  - Rookery Nook — Menier Chocolate Factory (2009)
044 - Sergeant Willis  - Howard Ward  - Attempts on Her Life — Royal Court Theatre Upstairs (1997)
045 - George Murray  - Jonathan Coy  - Hedda Gabler — Hampstead Theatre (1988)
046 - Edna Braithwaite (as Myanna Buring)  - MyAnna Buring  - Strangers on a Train — Gielgud Theatre (2013)
047 - Mr. Dawes  - Patrick Brennan  - Hamlet — Barbican Theatre (1989)
048 - Green  - Nigel Harman  - A Chorus of Disapproval — Harold Pinter Theatre (2012)
049 - Mr. Mason  - Paul Copley  - Prin — Lyric Hammersmith (1989)
050 - Miss Denker  - Sue Johnston  - The Mysteries - Doomsday — Cottesloe Theatre (1999)
051 - Mabel Lane Fox  - Catherine Steadman  - Witness for the Prosecution — Concil Room, County Hall (2018)
052 - Lady Shackleton  - Harriet Walter  - Three Birds Alighting on a Field — Royal Court (1991)
053 - Veteran  - Howard Gossington  - Nation — Olivier Theatre, National Theatre (2009)
054 - Kiernan Branson  - Ruairi Conaghan  - Trust — Royal Court Theatre Upstairs (1999)
055 - Kemal Pamuk  - Theo James  - Sex With Strangers — Hampstead Theatre (2017)
056 - Evelyn Napier  - Brendan Patricks  - Drawing the Line — Hampstead Theatre (2013)
057 - Larry Grey  - Charlie Anson  - Richard II — Old Vic (2005)
058 - Count Rostov  - Christopher Rozycki  - The Editing Process — Royal Court (1994)
059 - Nurse  - Elizabeth Hill  - The Suicide — Lyttelton Theatre (2016)
060 - Sir Richard Carlisle  - Iain Glen  - King Lear — Royal Court (1993)
061 - Michael Gregson  - Charles Edwards  - All My Sons — Cottesloe Theatre (2000)
062 - Mrs. Margie Drewe  - Emma Lowndes  - Whose Life is it Anyway — Comedy Theatre (2005)
063 - Charles Grigg  - Nicky Henson  - Much Ado About Nothing — Strand Theatre (1989)
064 - Sir Michael Reresby  - Ronald Pickup  - The Cherry Orchard — Aldwych Theatre (1989)
065 - Postmistress  - Helen Sheals  - Through The Mill — Southwark Playhouse (2016)
066 - Reverend Travis  - Michael Cochrane  - Nuremberg - War Crimes Trial — Tricycle Theatre (1996)
067 - Artificial Limbs Man  - Roger Morlidge  - Henry V — Barbican Theatre (1997)
068 - Archbishop of York  - Michael Culkin  - Morphic Resonance — Donmar Warehouse (1999)
069 - Lady Sinderby  - Penny Downie  - The Merchant of Venice — Barbican Theatre (1994)
070 - White Feather Girl  - Gwendolen Chatfield  - The Playboy of the Western World — Old Vic (2011)
071 - Amelia Cruikshank  - Phoebe Sparrow  - Fathers and Sons — Donmar Warehouse (2014)
072 - Mr. McCree  - Ron Donachie  - Scenes from the Big Picture — Cottesloe Theatre (2003)
073 - Horace Bryant (as Kevin R. McNally)  - Kevin McNally  - Hidden Laughter — Vaudeville Theatre (1990)
074 - John Drake  - Fergus O'Donnell  - Macbeth — Greenwich Theatre (1995)
075 - Inspector Vyner  - Louis Hilyer  - Troilus and Cressida — Barbican Theatre (1996)
076 - Lord Hepworth  - Nigel Havers  - See U Next Tuesday — Albery Theatre (2003)
077 - Madeleine Allsopp  - Poppy Drayton  - The Green Bay Tree — Jermyn Street Theatre (2014)
078 - Lord Aysgarth  - James Fox  - Resurrection Blues — Old Vic Theatre (2006)
079 - Liberal Candidate  - Jamie de Courcey  - Plenty — Albery Theatre (1999)
080 - Simon Bricker  - Richard E. Grant  - Otherwise Engaged — Criterion Theatre (2006)
081 - White Feather Girl  - Rosie Jones  - Berenice — Donmar Warehouse (2012)
082 - Henry Lang  - Cal MacAninch  - Anna Karenina — Tricycle Theatre (1992)
083 - Sarah Bunting  - Daisy Lewis  - Three Sisters on Hope Street — Hampstead Theatre (2008)
084 - Jack Ross  - Gary Carr  - Nation — Olivier Theatre (2009)
085 - Postmaster  - Jonathan Jaynes  - Saint Joan — Olivier Theatre (2007)
086 - John Harding  - Philip Battley  - Amadeus — Wilton's Music Hall (2006)
087 - Major Charles Bryant  - Daniel Pirrie  - The Vortex — Richmond Theatre (2008)
088 - Duchess of Yeovil  - Joanna David  - Home Chat — Finborough Theatre (2016)
089 - Dent  - Karl Haynes  - Road — Lyric Hammersmith (2003)
090 - Dr. Ryder  - Richard Teverson  - A Woman of No Importance — Theatre Royal Haymarket (2003)
091 - Laura Edmunds  - Antonia Bernath  - Chariots of Fire — Hampstead Theatre (2012)
092 - Prince of Wales  - Oliver Dimsdale  - The Tempest — The Pit (2000)
093 - Hugh 'Shrimpie' MacClare, Marquess of Flintshire  - Peter Egan  - Three Hotels — Tricycle Theatre (1993)
094 - Lucy  - Hayley Jayne Standing  - Dance of Death — Lyric Theatre (2003)
095 - Doctor at Moorfields Hospital  - Ian Kelly  - A Busy Day — Lyric Theatre (2000)
096 - General Robertson  - Jeremy Clyde  - Half the Picture — Tricycle Theatre (1994)
097 - Lady Manville  - Sarah Crowden  - A Midsummer Night's Dream — Barbican Theatre (1989)
098 - Sir John Darnley  - Adrian Lukis  - Macbeth — Barbican Theatre (1993)
099 - Army Doctor  - Graham Padden  - Shadowlands — Richmond Theatre (2007)
100 - Hairdresser  - Jamie Bradley  - A Matter of Life and Death — Olivier Theatre, National Theatre (2007)
101 - Paperboy  - Perry Millward  - Torch Song Trilogy — Menier Choclate Factory (2012)
102 - Lynch  - Andrew Westfield  - A Streetcar Named Desire — Lyttelton Theatre (2002)
103 - Princess Irina  - Jane Lapotaire  - Hamlet — Barbican Theatre (1992)
104 - Major Patrick Gordon  - Trevor White  - Aunt Dan and Lemon — Royal Court (2009)
105 - Waiter  - Tristan Beint  - Country Wife — Theatre Royal Haymarket (2007)
106 - Mrs. Drake  - Cathy Sara  - King Lear — Hackney Empire (1995)
107 - Mrs. Bartlett  - Clare Higgins  - A Midsummer Night's Dream — Barbican Theatre (1989)
108 - Lieutenant Edward Courtenay  - Lachlan Nieboer  - Country Magic — Finborough Theatre (2009)
109 - Ethan Slade  - Michael Benz  - A New World — Shakespeare's Globe (2009)
110 - Susan MacClare, Marchioness of Flintshire  - Phoebe Nicholls  - Three Sisters — The Queens Theatre (1990)
111 - Mr. Glover  - Trevor Cooper  - According to Hoyle — Hampstead Theatre (1995)
112 - Lady Anstruther  - Anna Chancellor  - Stanley — Cottesloe Theatre (1996)
113 - High Sheriff  - Gerard Mcdermott  - Antony and Cleopatra — Riverside Studios (1995)
114 - Auctioneer  - Nicholas Lumley  - The Magistrate — Olivier Theatre (2012)
115 - Mead  - Edmund Kente  - La Grande Magia — Lyttelton Theatre (1995)
116 - Nurse  - Issy Van Randwyck  - Calico — Duke of York's (2004)
117 - Prosecution Barrister  - Nick Sampson  - The Relapse (or Virtue in Danger) — Olivier Theatre (2001)
118 - Mrs. Pelham  - Patricia Hodge  - Heartbreak House — Almeida Theatre (1997)
119 - Doctor  - David Acton  - King Lear — Young Vic (1997)
120 - Racing Commentator  - Peter Hamilton-Dyer  - King Lear — Shakespeare's Globe Theatre (2001)
121 - Medical Officer  - Richard Hansell  - A Patriot for Me — Barbican Theatre (1995)
122 - Tim Grey  - Ed Cooper Clarke  - The Madness Of George III — Richmond Theatre (2011)
123 - Stall Holder  - Joshua Richards  - As You Like It — The Pit (2000)
124 - General Sir Herbert Strutt  - Julian Wadham  - Mountain Language — Lyttelton Theatre (1988)
125 - Neville Chamberlain  - Rupert Frazer  - The White Devil — Olivier Theatre (1991)
126 - Sir Philip Tapsell  - Tim Pigott-Smith  - Charles III — Almeida Theatre (2014)
127 - Sir Mark Stiles  - James Greene  - Una Pooka — Tricycle Theatre (1992)
128 - Mr. Charkham  - Mark Penfold  - A Long Way From Home — Tricycle Theatre (1991)
129 - Farmer  - Nigel Betts  - As You Like It — The Old Vic (1989)
130 - Marigold Shore  - Sharon Small  - The London Cuckolds — Lyttelton Theatre (1998)
131 - Diana Clark  - Alice Patten  - Hedda — Gate Theatre (2008)
132 - Footman  - Richard Dempsey  - Dance of Death — Tricycle Theatre (1998)
133 - Registrar  - Stephen Omer  - No Villain — Old Red Lion Theatre (2015)
134 - King George V  - Guy Williams  - Rose Rage Part 1 — Theatre Royal Haymarket (2002)
135 - Hotel Porter  - Matthew Jure  - Talk Radio — Old Red Lion Theatre (2017)
136 - Davis  - Stephen Ventura  - A Midsummer Night's Dream — Almeida Theatre (1996)
137 - Abbey Visitor  - Tom Morley  - Five Finger Exercise — The Print Room (2016)
138 - Inspector Stanford  - Tony Turner  - The Alchemist — Olivier Theatre (1996)
139 - Hospital Doctor  - David Sibley  - The Positive Hour — Hampstead Theatre (1997)
140 - Hotel Receptionist  - Keiran Flynn  - Duchess of Malfi — Lyttelton Theatre (2003)
141 - John Ward, MP  - Stephen Critchlow  - Remains of the Day — Oxford Playhouse (2019)