Rachael Grinham (lahir 22 Januari 1977 di Toowoomba, Queensland) ialah seorang pemain skuasy profesional dari Australia. Dia memenangi Terbuka British pada tahun 2003 dan 2004. Disamping dia juga merupakan naib juara Terbuka Dunia pada tahun 2005. Dia menduduki ranking No. 1 dunia pada tahun 2004.
Adik Rachael, Natalie Grinham juga seorang pemain skuasy yang handal dan terkemuka.
Semasa Sukan Komanwel 2006, Rachael memenangi pingat perak dalam acara perseorangan wanita selepas tumpas kepada adiknya Natalie di peringkat akhir. Pasangan adik-beradik itu kemudiannya berpasangan untuk memenangi pingat emas dalam acara berpasangan wanita.
Gelaran WISPA
Kejuaraan
| Tahun | Kejohanan | Saingan Perlawanan Akhir | mata Perlawanan Akhir |
| 1998 | Open Toulouse Central |  Tracey Shenton
| |
| 1999 | Swiss Open |  Claire Waddell |
9-2, 9-6, 9-3 |
| 1999 | Germering Open |  Sabine Schoene |
9-2, 5-9, 10-8, 9-7 |
| 1999 | Indian Open |  Claire Nitch |
9-6, 0-9, 9-5, 9-7 |
| 2000 | Milo National Open |  Nicol David |
9-2, 9-4, 9-6 |
| 2000 | Indian Open |  Salma Shabana |
9-2, 9-2, 9-1 |
| 2001 | Kuala Lampur Open |  Natalie Grinham
|
7-9, 0-9 ret. |
| 2001 | DMC Open | Nicol David |
9-4, 9-2, 9-4 |
| 2002 | Singapore Open | Tania Bailey |
9-4, 9-1, 9-7 |
| 2002 | Credit Suisse Privilege Ladies Open |  Natalie Grainger |
9-3, 9-5, 9-7 |
| 2003 | Vassar College Class of 1932 | Vicky Botwright |
9-0, 9-2, 9-4 |
| 2003 | British Open | Cassie Jackman |
9-3, 7-9, 9-2, 9-5 |
| 2004 | Sheikha Al Saad Kuwait Open | Cassie Jackman |
2-9, 9-6, 9-2, 9-5 |
| 2004 | Texas Open | Cassie Jackman |
9-5, 9-5, 9-5 |
| 2004 | Hurghada International Open | Omneya Abdel Kawy |
9-5, 9-1, 9-4 |
| 2004 | Bahrain WISPA Classic Open | Cassie Jackman |
5-9, 9-4, 9-4, 9-2 |
| 2004 | British Open | Natalie Grainger |
3-9, 9-5, 9-0, 9-3 |
| 2005 | Qatar Airways Challenge | Natalie Grainger |
2-9, 10-8, 9-2, 9-2 |
| 2005 | Hurghada International Open | Omneya Abdel Kawy |
1-9, 2-9, 9-4, 9-3, 10-8 |
| 2005 | PMI Women's Open |  Vanessa Atkinson |
9-2, 9-2, 9-4 |
| 2005 | Hedonism II Open | Omneya Abdel Kawy |
7-9, 9-1, 9-2, 9-4 |
| 2006 | Carol Weymuller US Open | Natalie Grainger |
6-9, 9-6, 9-1, 1-9, 9-4 |
| 2007 | Hurghada International Open | Omneya Abdel Kawy |
9-4, 9-6, 9-4 |
| 2007 | Alexandria Sporting Club Open | Engy Kheirallah |
2-9, 9-3, 9-1, 9-4 |
| 2007 | British Open | Nicol David |
7-9, 4-9, 9-3, 10-8, 9-1 |
| 2007 | Vassar College Class of 1932 Open | Natalie Grainger |
9-7, 10-8, 6-9, 1-9, 9-6 |
| 2007 | World Open | Natalie Grinham |
9-4, 10-8, 9-2 |
Naib Juara
| Tahun | Kejohanan | Saingan Perlawanan Akhir | Mata Perlawanan Akhir |
| 1998 | Isostar - Beverwijk | Tracey Shenton
| |
| 2000 | Mexican Open | Sarah Fitz-Gerald |
2-9, 4-9, 6-9 |
| 2001 | Deloitte U. Touch Cup | Vanessa Atkinson |
6-9, 1-9, 7-9 |
| 2003 | Helioplis Open |  Carol Owens |
5-9, 5-9, 4-9 |
| 2003 | Hurghada International Championship | Carol Owens |
5-9, 1-9, 5-9 |
| 2004 | Brunei International | Vanessa Atkinson |
8-10, 5-9, 9-3, 9-2, 10-8 |
| 2004 | Qatar Classic Open | Vanessa Atkinson |
4-9, 7-9, 6-9 |
| 2005 | Texas Open | Vanessa Atkinson |
10-9, 9-0, 9-4, 9-3, 9-2 |
| 2005 | CP/CSP Open | Nicol David |
10-8, 2-9, 6-9, 7-9 |
| 2006 | Hurghada International Open | Omneya Abdel Kawy |
6-9, 2-9, 9-7, 9-0, 2-9 |
| 2006 | Qatar Airways Challenge | Nicol David |
9-4, 5-9, 0-9, 0-9 |
| 2006 | Hotel Equatorial Penang Open | Nicol David |
5-9, 9-6, 5-9, 3-9 |
| 2006 | Dunlop British | Nicol David |
4-9, 1-9, 4-9 |
| 2007 | Dutch Open | Nicol David |
9-4, 9-1, 9-6 |