The Japan Women's Open Tennis is a professional women's tennis tournament played on outdoor hard courts. The event is affiliated with the Women's Tennis Association (WTA), and is an WTA 250 tournament on the WTA Tour. As successor to the Japan Open (where men and women played simultaneously, up to 2008) the event was held in women-only form for the first time in 2009, and was the second tournament of the season held in Japan: the Pan Pacific Open, a Premier 5 tournament, was held two weeks before. In 2015, the event was moved from Osaka to Tokyo and in 2018 to Hiroshima, before returning to Osaka in 2023 after a three year hiatus.

Location	Year	Champion	Runner-up	Score
Osaka	2024	Suzan Lamens	Kimberly Birrell	6–3, 6–3
	2023	Ashlyn Krueger	Zhu Lin	6–3, 7–6(8–6)
2022		no competition (due to financial crisis)
2021		no competition (due to COVID-19 pandemic)[1][2]
2020
Hiroshima	2019	Nao Hibino	Misaki Doi	6–3, 6–2
	2018	Hsieh Su-wei	Amanda Anisimova	6–2, 6–2
Tokyo	2017	Zarina Diyas	Miyu Kato	6–2, 7–5
	2016	Christina McHale	Kateřina Siniaková	3–6, 6–4, 6–4
	2015	Yanina Wickmayer	Magda Linette	4–6, 6–3, 6–3
Osaka	2014	Samantha Stosur (3)	Zarina Diyas	7–6(9–7), 6–3
	2013	Samantha Stosur (2)	Eugenie Bouchard	3–6, 7–5, 6–2
	2012	Heather Watson	Chang Kai-chen	7–5, 5–7, 7–6(7–4)
	2011	Marion Bartoli	Samantha Stosur	6–3, 6–1
	2010	Tamarine Tanasugarn	Kimiko Date-Krumm	7–5, 6–7(7–4), 6–1
	2009	Samantha Stosur	Francesca Schiavone	7–5, 6–1

Location	Year	Champions	Runners-up	Score
Osaka	2024	Ena Shibahara Laura Siegemund	Cristina Bucșa Monica Niculescu	3–6, 6–2, [10–2]
	2023	Anna-Lena Friedsam Nadiia Kichenok	Anna Kalinskaya Yulia Putintseva	7–6(7–3), 6–3
2022		no competition (due to financial crisis)
2021		no competition (due to COVID-19 pandemic)[1][2]
2020
Hiroshima	2019	Misaki Doi Nao Hibino	Christina McHale Valeria Savinykh	3–6, 6–4, [10–4]
	2018	Eri Hozumi Zhang Shuai (2)	Miyu Kato Makoto Ninomiya	6–2, 6–4
Tokyo	2017	Shuko Aoyama (3) Yang Zhaoxuan	Monique Adamczak Storm Sanders	6–0, 2–6, [10–5]
	2016	Shuko Aoyama (2) Makoto Ninomiya	Jocelyn Rae Anna Smith	6–3, 6–3
	2015	Chan Hao-ching Chan Yung-jan	Misaki Doi Kurumi Nara	6–1, 6–2
Osaka	2014	Shuko Aoyama Renata Voráčová	Lara Arruabarrena Tatjana Maria	6–1, 6–2
	2013	Kristina Mladenovic Flavia Pennetta	Samantha Stosur Zhang Shuai	6–4, 6–3
	2012	Raquel Kops-Jones Abigail Spears	Kimiko Date-Krumm Heather Watson	6–1, 6–4
	2011	Kimiko Date-Krumm Zhang Shuai	Vania King Yaroslava Shvedova	7–5, 3–6, [11–9]
	2010	Chang Kai-chen Lilia Osterloh	Shuko Aoyama Rika Fujiwara	6–0, 6–3
	2009	Chuang Chia-jung Lisa Raymond	Chanelle Scheepers Abigail Spears	6–2, 6–4

• Japan Open
• Pan Pacific Open