Here's a list of actors from Season 6 of Game of Thrones 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 Game of Thrones - Season 6 - Cast list used to make this list
01 - Jon Snow - Kit Harington - posh — Royal Court Theatre (2010)
02 - Petyr 'Littlefinger' Baelish - Aidan Gillen - The Water Engine — Hampstead Theatre (1989)
03 - Davos Seaworth - Liam Cunningham - Goodnight Siobhan — Royal Court (1990)
04 - Margaery Tyrell - Natalie Dormer - 0.45 — Michael Frayn Space, Hampstead Theatre (2010)
05 - Arya Stark - Maisie Williams - I and You — Hampstead Theatre (2018)
06 - High Sparrow - Jonathan Pryce - A Reckoning — Soho Theatre (2003)
07 - Lord Varys - Conleth Hill - The Government Inspector — Tricycle Theatre (1994)
08 - Ellaria Sand - Indira Varma - Othello — Cottesloe Theatre (1997)
09 - Bronn - Jerome Flynn - Timon of Athens — Young Vic (1991)
10 - Ramsay Bolton - Iwan Rheon - Remembrance Day — Royal Court Upstairs (2011)
11 - Theon Greyjoy - Alfie Allen - The Spoils — Trafalgar Studios (2016)
12 - Gilly - Hannah Murray - Martine — Finborough Theatre (2014)
13 - Olenna Tyrell - Diana Rigg - All for Love — Almeida Theatre (1991)
14 - Grey Worm - Jacob Anderson - King Lear — Young Vic (2009)
15 - Lady Crane - Essie Davis - A Streetcar Named Desire — Lyttelton Theatre (2002)
16 - Yara Greyjoy - Gemma Whelan - Dark Vanilla Jungle — Soho Theatre (2014)
17 - Izembaro - Richard E. Grant - Otherwise Engaged — Criterion Theatre (2006)
18 - Brynden 'Blackfish' Tully - Clive Russell - Our Country's Good — Royal Court (1989)
19 - Walder Frey - David Bradley - King Lear — Lyttelton Theatre (1990)
20 - Grand Maester Pycelle - Julian Glover - Julius Caesar — Barbican Theatre (1996)
21 - Qyburn - Anton Lesser - Wild Oats — Lyttelton Theatre (1995)
22 - Yezzan zo Qaggaz - Enzo Cilenti - Perfect Days — Hampstead Theatre (1999)
23 - Roose Bolton - Michael McElhatton - Shining City — Royal Court Theatre (2004)
24 - Edmure Tully - Tobias Menzies - Platonov — Almeida at Kings Cross (2001)
25 - Jorah Mormont - Iain Glen - King Lear — Royal Court (1993)
26 - Kevan Lannister - Ian Gelder - The Front Page — Donmar Warehouse (1997)
27 - Benjen Stark - Joseph Mawle - Last Days of Judas Iscariot — Almeida Theatre (2008)
28 - Harald Karstark - Paul Rattray - Dinner — Loft (2002)
29 - The Waif - Faye Marsay - Road — Royal Court Theatre (2017)
30 - Meera Reed - Ellie Kendrick - Romeo and Juliet — Shakespeare's Globe (2009)
31 - Alliser Thorne - Owen Teale - Berenice — Cottesloe Theatre (1990)
32 - Beric Dondarrion - Richard Dormer - Una Pooka — Tricycle Theatre (1992)
33 - Robett Glover - Tim McInnerny - Valued Friends — Hampstead Theatre (1989)
34 - Balon Greyjoy - Patrick Malahide - In the Ruins — Royal Court (1990)
35 - Thoros of Myr - Paul Kaye - Our Country's Good — Olivier Theatre (2015)
36 - Doran Martell - Alexander Siddig - Holy Warriors — Shakespeare's Globe (2014)
37 - Areo Hotah (as DeObia Oparei) - Deobia Oparei - A Midsummer Night's Dream — Barbican Theatre (1989)
38 - Septa Unella - Hannah Waddingham - Spamalot — Palace Theatre (2006)
39 - Black Walder Rivers - Tim Plester - Lifecoach — Trafalgar Studios 2 (2008)
40 - Lothar Frey - Daniel Tuite - A Prayer for Owen Meany — Lyttelton Theatre (2002)
41 - Randyll Tarly - James Faulkner - A Patriot for Me — Barbican Theatre (1995)
42 - Osha - Natalia Tena - The Clean House — Richmond Theatre (2008)
43 - Podrick Payne - Daniel Portman - The Collector — The Vaults, Waterloo (2016)
44 - Aeron Greyjoy - Michael Feast - Measure for Measure — Barbican Theatre (1995)
45 - Gatins - Ricky Champ - Wildefire — Hampstead Theatre (2014)
46 - Melessa Tarly - Samantha Spiro - Cleo Camping Emmanuelle and Dick — Lyttelton Theatre (1998)
47 - Lancel Lannister - Eugene Simon - For King and Country — Southwark Playhouse (2018)
48 - Dim Dalba - Murray McArthur - A Doll's House — The Playhouse Theatre (1996)
49 - Leaf - Kae Alexander - Teh Internet Is Serious Business — Royal Court Theatre (2014)
50 - Camello - Kevin Eldon - Pinter's People — Theatre Royal Haymarket (2005)
51 - Yohn Royce - Rupert Vansittart - Arsenic and Old Lace — Strand Theatre (2003)
52 - Ironborn #1 - Darrell D'Silva - Spanish Tragedy — The Pit (1997)
53 - Clarenzo - Rob Callender - Another Country — Trafalgar Studios (2014)
54 - Myranda - Charlotte Hope - Buried Child — Trafalgar Studios (2016)
55 - Aerys Targaryen - David Rintoul - Etta Jenks — Royal Court (1990)
56 - Talla Tarly - Rebecca Benson - Let The Right One In — Royal Court Theatre (2013)
57 - Dosh khaleen High Priestess - Souad Faress - The White Devil — Olivier Theatre (1991)
58 - Zanrush - Gerald Lepkowski - In Arabia - We'd All Be Kings — Hampstead Theatre (2003)
59 - Mummer #3 - Brendan O'Rourke - Incident at Vichy — Finborough Theatre (2017)
60 - Arthur Dayne - Luke Roberts - Kes — Lyric Hammersmith (2003)
61 - Young Ned Stark - Sebastian Croft - Coriolanus — Donmar Warehouse (2013)
62 - Gerold Hightower - Eddie Eyre - The Seagull — Richmond Theatre (2013)
63 - Lannister Captain - Richard Laing - Lady Windermere's Fan — Theatre Royal Haymarket (2002)
64 - Braavosi Woman #1 - Kate Anthony - The Cherry Orchard — Aldwych Theatre (1989)
65 - Loyal Night's Watchman #1 - Steve Cash - Translations — Olivier Theatre (2018)
66 - Braavosi Woman #2 - Sally Mortemore - The Lady of Pleasure — White Bear (2011)
67 - Handmaid - Sabrina Bartlett - Cyrano de Bergerac — Southwark Playhouse (2016)
68 - Eddard 'Ned' Stark (archive footage) (uncredited) - Sean Bean - Killing the Cat — Royal Court Theatre Upstairs (1990)
69 - The Night King (archive footage) (uncredited) - Richard Brake - Camera Obscura — Almeida Rehearsal Room (2002)
70 - Catelyn Stark (archive footage) (uncredited) - Michelle Fairley - Factory Girls — Tricycle Theatre (1990)
71 - Wyman Manderly - Sean Blowers - As You Like It — The Old Vic (1989)
72 - Robb Stark (archive footage) (uncredited) - Richard Madden - Be Near Me — Donmar Warehouse (2009)