Kaija Marja Mustonen (born 4 August 1941 in Helsinki) is a former speed skater from Finland.

After winning silver and bronze at the 1964 Winter Olympics of Innsbruck, Mustonen went on to win gold and silver at the 1968 Winter Olympics of Grenoble.

Her Olympic performance was acknowledged by naming her Finnish female athlete of the year in 1964 and 1968.

[1] She competed in ten World Allround Championships from 1958 to 1968 (every year except 1959), but never won a medal in the final classification, a fourth place in 1964 being her best result.

This biographical article on a speed skater in Finland is a stub.