HP Open

Japan Women's Open Tennis
Tournament information
Founded	2009
Editions	8 (2016)
Location	Osaka, Japan (2009–2014) Tokyo, Japan (2015–)
Venue	Ariake Tennis Forest Park (2015-) Utsubo Tennis Center (2009-2014)
Surface	Hard / outdoors
Draw	32M / 32Q / 16D
Prize money	$250,000
Website	jw-open.jp
Current champions
Women's singles	Christina McHale
Women's doubles	Shuko Aoyama Makoto Ninomiya

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 International-level 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 Five tournament, was held two weeks before. In 2015, the event was moved from Osaka to Tokyo.