| Player | Position | From | Until | |
|---|---|---|---|---|
| Gary Abraham | Fly-half | 1992 | 1992 | |
| Doug Ackerman | Back row | 1950 | 1953 | |
| Rob Ackerman | Centre | 1981 | 1984 | |
| Damien Adams | Lock | 2001 | 2001 | |
| Mark Addis | Centre | 2005 | 2006 | |
| Eddie Aholelei | Prop | 2014 | 2014 | |
| Daniel Ajuwa | Wing | 2011 | 2011 | |
| Joe Ajuwa | Wing | 2013 | 2013 | |
| Ogwen Alexander | Back row | 1974 | 1975 | |
| Luke Allen | 2011 | 2012 | ||
| Morgan Allen | Lock | 2018 | 2019 | |
| Jared Almond-Roberts | 2015 | 2015 | ||
| James Alvis | Prop | 1993 | 1994 | |
| Chris Anderson | Fly-half | 2010 | 2011 | |
| John Anderson | Prop | 1969 | 1969 | |
| John Anderson | Back row | 1956 | 1956 | |
| Adrian Anthony | Lock | 1964 | 1964 | |
| John Anthony | Full-back | 1973 | 1973 | |
| Llywarch Ap Myrddin | Full-back | 2015 | 2016 | |
| Rob Appleyard | Back row | 2000 | 2000 | |
| John Apsee | Centre | 1988 | 1988 | |
| Ben Armstrong | 2004 | 2004 | ||
| Paul Armstrong | Centre | 1993 | 1996 | |
| Paul Arnold | Lock | 2000 | 2000 | |
| T Arnott | 1925 | 1929 | ||
| Jonny Arr | Scrum-half | 2009 | 2009 | |
| David Arthur | 1982 | 1984 | ||
| Tom Arthur | Lock | 1925 | 1929 | |
| Josh Ashby Moscardini | Full-back | 2016 | 2020 | |
| Gavin Ashman | Fly-half | 2007 | 2008 | |
| Lyn Ashman | 1950 | 1951 | ||
| Cliff Ashton | Fly-half | 1957 | 1960 | |
| Ben Atkins | Back row | 1993 | 1997 | |
| William Atwill | Prop | 1974 | 1974 | |
| Cliff Axford | 1932 | 1935 | ||
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