Seiko Okamoto (岡本 聖子, Okamoto Seiko) (born 14 March 1978) is a former Japanese professional tennis player.
|Country (sports)|| Japan|
|Born||14 March 1978|
|Career titles||2 ITF|
|Highest ranking||No. 178 (16 January 2006)|
|Grand Slam Singles results|
|Australian Open||Q2 (2008)|
|French Open||Q1 (2006)|
|US Open||Q2 (2005)|
|Career titles||1 WTA, 15 ITF|
|Highest ranking||No. 123 (1 November 2004)|
|Grand Slam Doubles results|
|Australian Open||1R (2004, 2005)|
Okamoto took part in the 2006 Bangalore Open but lost in the first round of singles qualifying and the first round of doubles alongside Ryōko Fuda. She has stated that her favorite surface to play on is hardcourt.
In her career, Okamoto won one doubles title on the WTA Tour, as well as two singles and 15 doubles titles on the ITF Women's Circuit.