Christina ("Stien") Wilhelmina Baas-Kaiser (20 May 1938 – 23 June 2022) was a Dutch speed skater.

[2] She was not selected for the 1964 Winter Olympics because of her 'old age' (25 at that time) but later turned out to be the first Dutch female world class speed skater.

In 1972, by then married and 33 years old, Baas-Kaiser was no longer really considered to be a favourite, especially not after her disappointing 11th place at the European Allround Championships.

At the 1972 Winter Olympics in Sapporo, Baas-Kaiser originally was not meant to skate, but since fellow Dutch skater Trijnie Rep had disappointed in the 500 m (finishing 20th) and the 1,000 m (finishing 24th), Baas-Kaiser was given a chance in the 1,500 m and the 3,000 m. And she turned it into something beautiful: On the 1,500 m, she won silver behind Dianne Holum, but ahead of Atje Keulen-Deelstra, and in the 3,000 m two days later, she became Olympic Champion ahead of Holum and Keulen-Deelstra.

She ended her skating career later that year with a silver medal at the World Allround Championships.