Johanna (Hanna) Sofia Rönnberg (16 April 1862 – 9 October 1946) was a Finnish artist and writer.

She belonged to the generation of women painters in the 1880s who adopted the French Realism style, becoming an active member of the Önningeby artists colony on the island of Åland.

[2] She became particularly attached to the artists colony at Önningeby where the painter Victor Westerholm had a summer house.

Her early works of outdoor scenes on Åland were inspired by the French en plein air movement.

[2] In 1910, Hanna Rönnberg moved and spent her later years in a villa on the coast in Kulosaari just outside Helsinki with a housekeeper Linda Ekholm, where she died on 9 October 1946.