Here's a list of actors from Season 3 of The Crown 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
Go to my The Crown - Season 3 - Cast list used to make this list
01 - Queen Elizabeth II - Olivia Colman - Long Day's Journey Into Night — Lyric Theatre (2000)
02 - Prince Philip, Duke of Edinburgh - Tobias Menzies - Platonov — Almeida at Kings Cross (2001)
03 - Lord Snowdon - Ben Daniels - Naked — Almeida Theatre (1998)
04 - Queen Elizabeth the Queen Mother - Marion Bailey - Beside Herself — Royal Court (1990)
05 - Princess Alice - Jane Lapotaire - Hamlet — Barbican Theatre (1992)
06 - Prince Charles - Josh O'Connor - Versailles — Donmar Warehouse (2014)
07 - Princess Anne - Erin Doherty - The Divide — Old Vic Theatre (2018)
08 - Winston Churchill - John Lithgow - The Magistrate — Olivier Theatre (2012)
09 - Lord Mountbatten - Charles Dance - Good — Donmar Warehouse (1999)
10 - Harold Wilson - Jason Watkins - Rafts and Dreams — Royal Court Theatre Upstairs (1990)
11 - Duke of Windsor - Derek Jacobi - Kean - or Disorder and Genius — The Old Vic (1990)
12 - Anthony Blunt - Samuel West - Henry IV part 1 — The Old Vic (1997)
13 - Michael Adeane - David Rintoul - Etta Jenks — Royal Court (1990)
14 - Martin Charteris - Charles Edwards - All My Sons — Cottesloe Theatre (2000)
15 - Martin Furnival Jones - Angus Wright - Hamlet — Barbican Theatre (1992)
16 - Porchey - John Hollingworth - Observe the sons of Ulster — Hampstead Theatre (2009)
17 - Edward Millward - Mark Lewis Jones - The Merchant of Venice — Barbican Theatre (1994)
18 - Patrick Dean - Michael Simkins - Burn This — Hampstead Theatre (1990)
19 - Cecil King - Rupert Vansittart - Arsenic and Old Lace — Strand Theatre (2003)
20 - John Armstrong - Colin Morgan - Vernon God Little — Young Vic (2007)
21 - Howell - Ifan Huw Dafydd - Raving — Hampstead Theatre (2013)
22 - W. Marvin Watson - Martin McDougall - Death of a Salesman — Lyttelton Theatre (1996)
23 - Robin Woods - Tim McMullan - The Miser — Olivier Theatre (1991)
24 - Duke of Gloucester - Michael Thomas - The Comedy of Errors — Barbican Theatre (2000)
25 - Marcia Williams (as Sinéad Matthews) - Sinead Matthews - The Birthday Party — Duchess Theatre (2005)
26 - Andrew Parker Bowles - Andrew Buchan - Man Who Had All The Luck — Donmar Warehouse (2008)
27 - Neil Armstrong - Henry Pettigrew - Anna Christie — Donmar Warehouse (2011)
28 - Fred Phillips - Richard Harrington - Gas Station Angel — Royal Court Theatre Upstairs (1998)
29 - Duchess of Gloucester - Penny Downie - The Merchant of Venice — Barbican Theatre (1994)
30 - Buzz Aldrin - Felix Scott - Kes — Lyric Hammersmith (2003)
31 - Roddy Llewellyn - Harry Treadaway - Over There — Royal Court (2009)
32 - Arthur Scargill - David Wilmot - A Skull in Connemara — Royal Court (1997)
33 - Edward Heath - Michael Maloney - Hamlet — Greenwich Theatre (1996)
34 - Michael Straight - Paul Hilton - Richard III — Barbican Theatre (1996)
35 - Emperor Hirohito - Togo Igawa - The King of Hell's Palace — Hampstead Theatre (2019)
36 - Gwen Edwards - Gwyneth Keyworth - As You Like It — Shakespeare's Globe (2015)
37 - Anne Tennant - Nancy Carroll - The Winter's Tale — Barbican Theatre (1999)
38 - Cecil Boyd-Rochfort - Julian Glover - Julius Caesar — Barbican Theatre (1996)
39 - Colin Tennant - Richard Teverson - A Woman of No Importance — Theatre Royal Haymarket (2003)
40 - James Burke - Jonathan Broadbent - A Midsummer Night's Dream — Albery Theatre (2001)
41 - John Barratt - Lucas Hare - The Doctor's Dilemma — Almeida Theatre (1998)
42 - Mountbatten's Valet - Harry Gostelow - Ivanov — Almeida Theatre (1997)
43 - Dr. Bodley Scott - Martin Wimbush - Dream of Perfect Sleep — Finborough Theatre (2014)
44 - Chronos - Miltos Yerolemou - The Winter's Tale — Barbican Theatre (1999)
45 - Duke of Norfolk - Patrick Ryecart - See U Next Tuesday — Albery Theatre (2003)
46 - Dean of Windsor - Clifford Rose - Hamlet — Barbican Theatre (1992)
47 - Bank of England Lawyer - Jasper Jacob - A Woman of No Importance — Theatre Royal Haymarket (2003)
48 - Tony Benn - Mark Dexter - The Glass Menagerie — Comedy Theatre (1995)
49 - Ben Bowen Thomas - Alan David - Apples — Royal Court (1989)
50 - Philip's Private Secretary - Patrick Toomey - Edward II — Shakespeare's Globe Theatre (2003)
51 - Tommy Lascelles - Pip Torrens - Stanley — Cottesloe Theatre (1996)
52 - Mary Wilson - Teresa Banham - Anna Karenina — Tricycle Theatre (1992)
53 - Barbara Castle - Lorraine Ashbourne - Babies — Royal Court (1994)
54 - MI5 Officer - Jim Creighton - Enemy of the People — Olivier Theatre (1997)
55 - Marquis Childs - Nigel Whitmey - Disneyland It Ain't — Royal Court Theatre Upstairs (1990)
56 - Editor - Roger Evans - Gas Station Angel — Royal Court Theatre Upstairs (1998)
57 - Mayor of Merthyr Tyfdil - Anthony O'Donnell - The Miser — Olivier Theatre (1991)
58 - Lord Chamberlain - Guy Oliver-Watts - The Prince of Homburg — Lyric Hammersmith (2002)
59 - Guardian Editor - Tony Bell - Rose Rage Part 1 — Theatre Royal Haymarket (2002)
60 - Lawrence E. Spivak - Colin Stinton - Speed-The-Plow — Lyttelton Theatre (1989)
61 - Arthur 'Bull' Hancock - John Finn - King Lear — The Old Vic (2003)
62 - Richard Crossman (as Aden Gillet) - Aden Gillett - Three Sisters — The Queens Theatre (1990)
63 - George Thomson - Stuart McQuarrie - Shining Souls — The Old Vic (1997)
64 - Co-Pilot - Alasdair Craig - A Midsummer Night's Dream — Comedy Theatre (2003)
65 - Priest Michael - Kevin Eldon - Pinter's People — Theatre Royal Haymarket (2005)
66 - John Betjeman - Tim Bentinck - Arcadia — Theatre Royal Haymarket (1994)
67 - Garter at Arms - Gerrard McArthur - John Bulls Other Island — Tricycle Theatre (2003)
68 - Priest 2 - Sam Parks - The Tempest — Shakespeare's Globe Theatre (2000)
69 - Local Woman 3 - Michelle McTernan - Flesh and Blood — Hampstead Theatre (2000)
70 - Local Man 1 - Mark Lewis - As You Like It — The Old Vic (1989)
71 - Jazz Band Musician - Andrew Joseph - The White Devil — Olivier Theatre (1991)
72 - Henrietta Woods - Penelope McGhie - Comic Potential — Lyric Theatre (1999)
73 - Councillor - Simon Armstrong - Hamlet — Shakespeare's Globe Theatre (2011)
74 - Supervisor - Nicholas McGaughey - King Lear — Barbican Theatre (1999)