Ritva Marjatta Kajosmaa (born 3 February 1938 in Vehkalahti) is a Finnish former cross-country skier who competed during the 1970s.

She competed in two Winter Olympics, earning a total of four medals.

For her successes in Nordic skiing and at the Holmenkollen, Kajosmaa received the Holmenkollen medal in 1971 (Shared with Berit Mørdre Lammedal and Reidar Hjermstad.).

All results are sourced from the International Ski Federation (FIS).

[1] This biographical article relating to Finnish cross-country skiing is a stub.