| Swimmers & Divers | ||||
|---|---|---|---|---|
| Name | Begin | End | City | State |
| Tracy Macaulay | 1999 | 1999 | ||
| Jordan MacDonald | 2016 | 2017 | Titusville | FL |
| Colby Mack | 2003 | 2006 | Satellite Beach | FL |
| Mary-de Mackie | 1978 | 1981 | ||
| Ken MacLean | 1991 | 1992 | Colleen MacMillan | 2009 | 2010 | New Britain | PA | Thaddius Macon | 2015 | 2017 | Marietta | GA | Akram Mahmoud | 2014 | 2018 | Cairo | Evan Mahoney | 2013 | 2015 | Bayville | NJ | Karen Malachows | 1988 | 1990 |
| Maggie Malaney | 2011 | 2012 | Findlay | OH |
| Katherine Malinski | 2015 | 2018 | Naperville | IL |
| Ryan Mallam | 1997 | 2000 | ||
| Matt Maloney | 1983 | 1986 | ||
| Elizabeth Maltby | 2013 | 2017 | Richmond | VA | Chay Malvasia | 2010 | 2013 | Columbia | SC | Elizabeth Mandrgoc | 2017 | 2018 | Fairfax | VA | Stephanie Margalis | 2002 | 2006 | Clearwater | FL | Lyle Markman | 2014 | 2018 | Austin | TX | Nikki Marshall | 1991 | 1991 |
| Ashley Martin | 2011 | 2012 | Rock Hill | SC |
| Michi Martin | 1984 | 1985 | ||
| Sarah Massey | 2001 | 2002 | ||
| Ellie Masterson | 2018 | 2019 | Louisville | KY |
| Brent Mathers | 1988 | 1992 | Kaelon May | 2004 | 2005 | Paige Maynard | 2015 | 2017 | Vacaville | CA | Denise McCarthy | 1992 | 1995 | Michelle McCarthy | 1993 | 1995 | Katherine McComas | 2015 | 2018 | Timonium | MD |
| Chris McCrary | 2001 | 2003 | ||
| Patrick McCrillis | 2014 | 2018 | Reno | NV |
| John McCullough | 1987 | 1987 | ||
| Scott McDonald | 1982 | 1985 | ||
| Dan McDonough | 1983 | 1984 | Jay McGarity | 1996 | 1996 | Clare McGovern | 2018 | 2019 | Landenberg | PA | Pete McGregor | 2005 | 2006 | Sinking Spring | PA | Steve McHenry | 1982 | 1983 | Carolynn McHugh | 2002 | 2005 |
| Meridith McKee | 2007 | 2010 | Wayne | PA |
| Shamtelle McLean | 2005 | 2010 | Morvant | |
| Kathleen McPadden | 1980 | 1983 | ||
| Val Mee | 1985 | 1985 | ||
| Dennis Meehan | 1989 | 1990 | David Melnik | 1983 | 1983 | Ana Menendez Nava | 2016 | 2018 | Pola de Siero | Chris Mercer | 1982 | 1985 | E.J. Mercer | 1992 | 1992 | Anne Merklinger | 1979 | 1982 |
| Tami Merrill | 1984 | 1986 | ||
| Heather Merritt | 2014 | 2018 | Huntersville | NC |
| Nicole Mertel | 2012 | 2015 | Henderson | NV |
| John Metts | 2010 | 2012 | Columbia | SC |
| Charlene Miller | 1994 | 1997 | Cole Miller | 2011 | 2015 | Regina | SSK | Makenzie Miller | 2014 | 2018 | Fulton | MD | Fynn Minuth | 2015 | 2018 | Regensburg | BAV | Adam Mitchell | 1982 | 1982 | Victoria Mitchell | 2013 | 2015 | Cary | NC |
| Andrew Mohrwinkel | 1998 | 1998 | ||
| Jon Moore | 1993 | 1994 | ||
| Travis Morrin | 2014 | 2018 | Mt. Pleasant | SC |
| Brooke Morton | 2012 | 2016 | Indialantic | FL |
| Sarah Mory | 2007 | 2008 | Haslett | MI | Ed Murphy | 2001 | 2004 | Ashley Murray | 1997 | 1999 | Dukes Murray | 1983 | 1984 | Sean Murray | 2004 | 2006 | Ashton | MD |