Alexandra Theodora Frosterus-Såltin (6 December 1837 – 29 February 1916, Vaasa) was a Finnish-Swedish genre painter and illustrator, who is also known for her altarpieces.

At the age of fourteen, she left home to become a private student of Robert Wilhelm Ekman in Turku, and studied with him for five years.

[1] In 1858, on Ekman's recommendation, she was asked to provide drawings for a publication by Raittiuden Ystävät (a Finnish temperance society), an anti-alcohol booklet called Turmiolan Tommin Elämäkerta ('The Life Story of Pernicious Tommy').

[3] The story itself (by an unknown writer) came to be referenced in several popular songs, as recently as 1982 by the Finnish rock band Eppu Normaali.

The following year, finding her income insufficient, she moved to Turku to become a teacher at the Art Society's drawing school, where she remained through 1889.