Olivia Eileen Baker (born 28 February 1979 in Upper Hutt, New Zealand) is a former weightlifting competitor for New Zealand who competed in the 2000 Summer Olympics.
Baker was the first female weightlifter from New Zealand to compete at the Olympics.
At the 2002 Commonwealth Games in Manchester she won a silver medal in the 75+ kg snatch, and two bronze medals in the 75+ kg clean and jerk and combined total.