2008 AIG Japan Open Tennis Championships – Women's singles

Virginie Razzano was the defending champion, but chose not to participate that year.

First-seeded Caroline Wozniacki won in the final 6–2, 3–6, 6–1, against fifth-seeded Kaia Kanepi.

Seeds
• # Caroline Wozniacki (champion)

• # 🇪🇸 Anabel Medina Garrigues (second round)

• # 🇨🇳 Zheng Jie (first round)

• # 🇷🇺 Maria Kirilenko (first round)

• # 🇪🇪 Kaia Kanepi (final)

• # 🇮🇱 Shahar Pe'er (second round)

• # 🇹🇭 Tamarine Tanasugarn (quarterfinals)

• # 🇨🇦 Aleksandra Wozniak (semifinals)