Alma Isabella Fahlstrøm (née Bosse; 23 November 1863 – 29 May 1946) was a well known Norwegian stage actress, director and theatre manager.

The theatre was especially known for a repertoire of light comedy, revues and operettas, as well as Norwegian drama.

The couple subsequently operated the Fahlstrøm Theater on Torggata in Oslo from 1903 to 1911.

[4][5] In 1912, the couple's only child, Arne Jonas Fahlstrøm (1893–1912) died in the Titanic disaster.

To help avoiding further shipping disasters, they donated nearly all their fortune to the Norwegian Sea Rescue Society, which used it to purchase two rescue boats that were named in their son's honor.