Harriet Sofie Bosse (19 February 1878 – 2 November 1961) was a Swedish–Norwegian actress.
A celebrity in her own day, Bosse is today most commonly remembered as the third wife of the playwright August Strindberg.
Bosse began her career in a minor company run by her forceful older sister Alma Fahlstrøm in Kristiania (now Oslo, the capital of Norway).
Having secured an engagement at the Royal Dramatic Theatre ("Dramaten"), the main drama venue of Sweden's capital Stockholm, Bosse caught the attention of Strindberg with her intelligent acting and exotic "oriental" appearance.
After a whirlwind courtship, which unfolds in detail in Strindberg's letters and diary, Strindberg and Bosse were married in 1901, when he was 52 and she 23.
Strindberg wrote a number of major roles for Bosse during their short and stormy relationship, especially in 1900–01, a period of great creativity and productivity for him.
Like his previous two marriages, the relationship failed as a result of Strindberg's jealousy, which some biographers have characterized as paranoid.
The spectrum of Strindberg's feelings about Bosse, ranging from worship to rage, is reflected in the roles he wrote for her to play, or as portraits of her.
Despite her real-life role as muse to Strindberg, she remained an independent artist.
Bosse married Swedish actor Anders Gunnar Wingard in 1908, and Swedish screen actor, director, and matinee idol Edvin Adolphson in 1927.
All three of her marriages ended in divorce after a few years, leaving her with a daughter by Strindberg and a son by Wingård.
On retiring after a high-profile acting career based in Stockholm, she returned to her roots in Oslo.