| McGuire, William, "Biff" | William "Biff" McGuire | Actor | 1980 | 1 | |
| McGuire, William, Francis | William Francis McGuire | Actor | 1993 | 2 | |
| McGunigle, Brian | Brian McGunigle | Actor | 1967 | 1 | |
| McHale, Elizabeth | Elizabeth McHale | Actor | 2020 | 1 | |
| McHale, Rosemary | Rosemary McHale | Actor | 1977 | 6 | |
| McHallem, Chris | Chris McHallem | Actor | 2003 - 2017 | 2 | |
| McHallem, Christopher | Christopher McHallem | Actor | 1992 | 3 | |
| McHattie , Stephen | Stephen McHattie | Actor | 1985 | 1 | |
| McHenry, Don | Don McHenry | Actor | 1937 | 1 | |
| McHugh, Florence | Florence McHugh | Actor | 1928 | 1 | |
| McInerney, Bernie | Bernie McInerney | Actor | 1975 - 1976 | 1 | |
| McInerney, Kathleen | Kathleen McInerney | Choreographer | 1996 | 1 | |
| McInnerny, Tim | Tim McInnerny | Actor | 2003 - 2010 | 6 | |
| McInnes, William | William McInnes | Actor | 1962 | 1 | |
| McInnis , Mark | Mark McInnis | Actor | 1990 | 1 | |
| McInroy, Bruce | Bruce McInroy | Costume Designer | 1982 - 1990 | 2 | |
| McIntosh , Neve | Neve McIntosh | Actor | 2010 | 1 | |
| McIntosh, Duncan | Duncan McIntosh | Translator | 2011 | 2 | |
| McIntosh, Duncan | Duncan McIntosh | Director | 1989 - 1996 | 2 | |
| McIntosh, Yanna | Yanna McIntosh | Actor | 2005 | 1 | |
| McIntyre, Colin | Colin McIntyre | Director | 1969 - 1980 | 2 | |
| McIntyre, Deirdre | Deirdre McIntyre | Lighting Designer | 1960 | 1 | |
| McIntyre, Heather | Heather McIntyre | Actor | 1925 | 2 | |
| McIntyre, Jo-Ann | Jo-Ann McIntyre | Actor | 1972 | 2 | |
| McKay, J. | J. McKay | Actor | 1907 | 1 | |
| McKay, John | John McKay | Actor | 1980 | 1 | |
| McKeating, Cealach | Cealach McKeating | Assistant Director | 2017 | 4 | |
| McKee, Beth | Beth McKee | Costume Designer | 1946 | 1 | |
| McKee, Lorraine | Lorraine McKee | Costume Designer | 1972 | 6 | |
| McKee, William, | William McKee | Actor | 1905 | 1 | |
| McKegg, Dorothy | Dorothy McKegg | Actor | 1969 | 1 | |
| McKeithen, Chris | Chris McKeithen | Actor | 2018 | 1 | |
| McKellen, Ian | Ian McKellen | Actor | 1972 - 1998 | 6 | |
| McKelvey, Michael | Michael McKelvey | Composer | 2010 | 1 | |
| McKendree, Rachel | Rachel McKendree | Actor | 2012 | 1 | 1 |
| McKenna , Seana | Seana McKenna | Actor | 2016 | 2 | |
| McKenna, Kathy | Kathy McKenna | Actor | 1980 | 1 | |
| McKenna, Alison | Alison McKenna | Actor | 2008 | 2 | |
| McKenna, Charlene | Charlene McKenna | Actor | 2013 - 2015 | 4 | |
| McKenna, Denise | Denise McKenna | Actor | 1972 | 1 | |
| McKenna, Ged | Ged McKenna | Actor | 2004 | 1 | |
| McKenna, Jill | Jill McKenna | Actor | 2007 | 1 | |
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