| McInnis, Morgan | Morgan McInnis | Set Designer | 2023 | 1 | |
| McInnes, William | William McInnes | Actor | 1962 | 1 | |
| McInnerny, Tim | Tim McInnerny | Actor | 2003 - 2010 | 6 | 1 |
| McInerney, Kathleen | Kathleen McInerney | Choreographer | 1996 | 1 | |
| McInerney, Bernie | Bernie McInerney | Actor | 1975 | 1 | |
| McHugh, Florence | Florence McHugh | Actor | 1928 | 1 | |
| McHenry, Don | Don McHenry | Actor | 1937 | 1 | |
| McHattie, Stephen | Stephen McHattie | Actor | 1985 | 2 | 1 |
| McHallem, Christopher | Christopher McHallem | Actor | 1992 | 3 | 1 |
| McHallem, Chris | Chris McHallem | Actor | 2003 - 2017 | 2 | 1 |
| McHale, Rosemary | Rosemary McHale | Actor | 1977 | 6 | 1 |
| McHale, Elizabeth | Elizabeth McHale | Actor | 2020 | 1 | |
| McGunigle, Brian | Brian McGunigle | Actor | 1967 | 1 | |
| McGuire, William, Francis | William Francis McGuire | Actor | 1993 | 2 | |
| McGuire, William, "Biff" | William "Biff" McGuire | Actor | 1980 | 1 | |
| McGuire, Sean | Sean McGuire | Actor | 2018 | 1 | |
| McGuire, Patti | Patti McGuire | Actor | 2019 | 1 | |
| McGuire, Pat | Pat McGuire | Actor | 2001 | 2 | |
| McGuire, Michael | Michael McGuire | Actor | 1961 - 1962 | 2 | |
| McGuire, Louis | Louis McGuire | Composer | 2009 | 1 | |
| McGuire, Lloyd | Lloyd McGuire | Actor | 1980 | 1 | |
| McGuire, John | John McGuire | Actor | 1907 | 1 | |
| McGuinness, Michael | Michael McGuinness | Actor | 1985 | 2 | |
| McGuinness, Frank | Frank McGuinness | Adaptation, Producer, Translator | 1987 - 2020 | 140 | 1 |
| Mcguinne, Sibeal | Sibeal Mcguinne | Actor | 1992 | 1 | |
| McGuinne, Brenda | Brenda McGuinne | Actor | 1962 | 2 | |
| McGuinn, Brenda | Brenda McGuinn | Actor | 1968 | 2 | |
| McGuiness, Frank | Frank McGuiness | Adaptation | 2022 | 1 | |
| McGuigan, Marcy | Marcy McGuigan | Actor | 2000 | 2 | 1 |
| McGrew, Melina | Melina McGrew | Actor | 2000 | 1 | |
| McGregor, Ross | Ross McGregor | Director | 2010 | 15 | |
| McGregor, Robbie | Robbie McGregor | Actor | 1984 | 1 | |
| McGregor, Rae | Rae McGregor | Dancer | 1939 | 1 | |
| McGregor, Patricia | Patricia McGregor | Actor | 1966 | 1 | |
| McGregor, Angela Punch | Angela Punch McGregor | Actor | 1974 | 1 | |
| McGregor-Laine, Susan | Susan McGregor-Laine | Actor | 2003 - 2007 | 2 | |
| McGreevy, Barbara | Barbara McGreevy | Actor | 1980 | 1 | |
| McGrath, Phil | Phil McGrath | Actor | 2022 | 1 | |
| McGrath, Liam | Liam McGrath | Actor | 2021 | 1 | |
| McGrath, Joseph | Joseph McGrath | Actor, Designer | 2010 | 2 | 1 |
| McGrath, Jenni | Jenni McGrath | Musician | 2006 | 1 | |
| McGrath, Jeff | Jeff McGrath | Actor | 2003 | 1 | |
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