Ruth Waithera Nganga (born August 17, 1958) is a retired sprinter from Kenya.
Waithera won twice three sprint events (100, 200 and 400 meters) at the East and Central African Championships; in 1977 and 1979.
[3] At the time she was studying at the University of Arizona and she won NCAA Division I Women's Indoor Championship in 400 metres in 1984.
She established the Avenue Sports Club in 1998 to give orphan children an opportunity to have a career in athletics.
[8] She is not to be confused with a Kenyan steeplechase runner, born in 1990, who is also named Ruth Waithera.