The 2012 HP Open was a women's tennis tournament played on outdoor hard courts sponsored by Hewlett-Packard. It was the fourth edition of the HP Open, and part of the WTA International tournaments of the 2012 WTA Tour. It was held at the Utsubo Tennis Center in Osaka, Japan, from October 8 through October 14, 2012. Heather Watson won the singles title.
See main article: 2012 HP Open – Singles.
Heather Watson defeated Chang Kai-chen 7–5, 5–7, 7–6(7–4)See main article: 2012 HP Open – Doubles.
Raquel Kops-Jones / Abigail Spears defeated 
Kimiko Date-Krumm / Heather Watson 6–1, 6–4| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Samantha Stosur | 9 | 1 | ||
| Zheng Jie | 22 | 2 | ||
| Christina McHale | 30 | 3 | ||
 Italy | Francesca Schiavone | 33 | 4 | |
 Kazakhstan | Yaroslava Shvedova | 36 | 5 | |
| Anabel Medina Garrigues | 39 | 6 | ||
| Chanelle Scheepers | 53 | 7 | ||
| Laura Robson | 60 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Tímea Babos
Petra Cetkovská Melinda Czink
Marina Erakovic
Olga Govortsova
Mandy Minella
Shahar Pe'er Sloane Stephens CoCo Vandeweghe Galina Voskoboeva
Aleksandra Wozniak Francesca Schiavone (right wrist injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Raquel Kops-Jones | Abigail Spears | 33 | 1 | |||
| Anabel Medina Garrigues | Zheng Jie | 49 | 2 | |||
| Darija Jurak | Katalin Marosi | 98 | 3 | |||
| Japan | Kimiko Date-Krumm | Heather Watson | 149 | 4 |
The following pair received wildcard into the doubles main draw:
