Sigrid Milfrid Sundby (13 July 1942 – 24 July 1977) was a Norwegian speed skater who competed internationally in the 1960s and 1970s.

[2] She won a bronze medal at the World Allround Speed Skating Championships for Women in 1970.

[1] Sundby dominated women's skating nationally for about a decade, winning the Norwegian allround championships in 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970 and 1973.

[1] Sundby died in Oslo on 24 July 1977, 35 years old.

This biographical article about a Norwegian speed skater is a stub.