Kristina Šmigun-Vähi (born 23 February 1977) is a former Estonian female cross-country skier and politician.

With two golds and one silver, Šmigun-Vähi is the most successful Estonian athlete in Olympic history (summer or winter), tying the record of men's cross-country skier Andrus Veerpalu.

Šmigun-Vähi has also found success at the FIS Nordic World Ski Championships, earning six medals.

On 2 July 2010, Šmigun-Vähi announced that she will quit her professional sport career to focus on her family and her daughter Victoria-Kris.

Šmigun-Vähi is married to her long-time manager Kristjan-Thor Vähi, She missed the 2007–08 and 2008–09 seasons due to pregnancy.