Karin Dorothea Wilhelmina Åhlin (25 November 1830 – September 30, 1899) was a Swedish educator.

After the death of her mother in 1847, she was left with the responsibility of raising and educating her younger siblings at the age of seventeen.

At this point, the normal profession for a middle-class girl in need to support herself was that of a teacher, and she started to give lessons in her home to not only her siblings but also to paying pupils.

She was an appreciated educator and was able to accept more and more pupils, some of them as guests in her home, an enterprise which gradually developed into the expanding Åhlinska skolan.

In 1890, Åhlin was presented with the royal medal Illis quorum meruere labores in gold for her achievements in the education of women in Sweden.