| McKereghan, William | William McKereghan | Actor | 1971 | 1 | |
| McKereghan, Kevin | Kevin McKereghan | Actor | 1971 | 1 | |
| McKereghan, Dan | Dan McKereghan | Adaptation, Director | 1997 | 2 | 1 |
| McKeown, Fintan | Fintan McKeown | Actor | 1980 - 2010 | 2 | |
| McKeown, Archie | Archie McKeown | Director | 2018 | 1 | |
| McKeowen, Elizabeth | Elizabeth McKeowen | Actor | 1950 | 1 | |
| McKeon, Belinda | Belinda McKeon | Adaptation | 2017 | 1 | 1 |
| McKenzie, Warren | Warren McKenzie | Actor | 1941 | 1 | |
| McKenzie, Sandra | Sandra McKenzie | Actor, Composer | 1961 - 1976 | 3 | |
| McKenzie, Michael | Michael McKenzie | Actor | 2000 | 1 | |
| McKenzie, Matt | Matt McKenzie | Sound Designer | 1995 - 1996 | 5 | |
| McKenzie, Jean | Jean McKenzie | Actor | 1942 | 1 | |
| McKenzie, Janice | Janice McKenzie | Actor | 2012 | 1 | |
| McKenzie, Jacqueline | Jacqueline McKenzie | Actor | 1991 | 1 | 1 |
| McKenzie, David | David McKenzie | Designer | 1980 | 1 | |
| McKenzie, Claire | Claire McKenzie | Composer, Sound Designer | 2015 | 2 | |
| McKenzie Miller, Johanna | Johanna McKenzie Miller | Actor | 2009 | 1 | |
| McKenna, Siobhan | Siobhan McKenna | Actor | 1951 | 1 | |
| McKenna, Sinéad | Sinéad McKenna | Lighting Designer | 2017 - 2023 | 2 | |
| McKenna, Seana | Seana McKenna | Actor | 2016 - 2020 | 2 | |
| McKenna, Kathy | Kathy McKenna | Actor | 1980 | 1 | |
| McKenna, Jill | Jill McKenna | Actor | 2007 | 1 | |
| McKenna, Ged | Ged McKenna | Actor | 2004 | 1 | |
| McKenna, Denise | Denise McKenna | Actor | 1972 | 1 | |
| McKenna, Charlene | Charlene McKenna | Actor | 2013 - 2015 | 4 | 1 |
| McKenna, Alison | Alison McKenna | Actor | 2008 | 2 | |
| McKendree, Rachel | Rachel McKendree | Actor | 2012 | 1 | 2 |
| McKelvey, Michael | Michael McKelvey | Composer | 2010 | 1 | |
| McKellen, Ian | Ian McKellen | Actor | 1972 - 1998 | 6 | |
| McKeithen, Chris | Chris McKeithen | Actor | 2018 | 1 | |
| McKegg, Dorothy | Dorothy McKegg | Actor | 1969 | 1 | |
| McKee, William | William McKee | Actor | 1905 | 1 | |
| McKee, Molly | Molly McKee | Actor | 2022 | 1 | |
| McKee, Lorraine | Lorraine McKee | Costume Designer | 1972 | 6 | |
| McKee, Beth | Beth McKee | Costume Designer | 1946 | 1 | |
| McKeating, Cealach | Cealach McKeating | Assistant Director | 2017 | 4 | |
| McKean, Kathy McKean | Kathy McKean McKean | Adaptation | 2024 | 1 | |
| McKay, John | John McKay | Actor | 1980 | 1 | |
| McKay, J. | J. McKay | Actor | 1907 | 1 | |
| McIntyre, Jo-Ann | Jo-Ann McIntyre | Actor | 1972 - 1973 | 2 | |
| McIntyre, Heather | Heather McIntyre | Actor | 1925 | 2 | |
| McIntyre, Deirdre | Deirdre McIntyre | Lighting Designer | 1960 | 1 | |
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