Johan Peter Broust Fahlstrøm (30 August 1867 – 28 July 1938) was one of Norway's leading male actors before World War I.

He debuted as an actor at the Christiania Theatre in 1887 in the play Julius Caesar by William Shakespeare.

In 1897, the couple opened the Central Theater in Christiania (now Oslo) with both concert and vaudeville venues.

Fahlstrøm appeared in a variety of roles and his wife served as director.

Fahlstrøm featured a farewell performance of The Pillars of Society by Henrik Ibsen in 1911, after which he decided to retire from the stage.