Yukiko Osada

is a retired Japanese swimmer, who specialized in butterfly events. Osada won two bronze medals in the 200 m butterfly and the medley relay at the 2003 Summer Universiade in Daegu, South Korea.

Osada qualified for the women's 200 m butterfly at the 2004 Summer Olympics in Athens, by attaining an A-standard entry time of 2:09.97 from the national championships. In the morning's preliminary heats, she recorded the eighth fastest qualifying time of 2:11.20 to secure her spot in the semifinal run. On the evening session, Osada failed to qualify for the final run, as she placed thirteenth overall in the semifinals, with a fourth slowest time of 2:11.35.