Gertrud is a Swedish 1906 play (drama), in three parts, by author and playwright Hjalmar Söderberg.
The main characters are the middle-aged Gertrud and three men she has a relationship with: her husband Gustav Kanning, a politician; her former lover Gabriel Lidman, an older poet; and her newfound love Erland Jansson, a young composer.
The first act is set in Gustaf Kanning's study at his home, where Gertrud, in the first scene, sits in the dark awaiting her husband's return from work.
Gertrud is faced with questions about the sacrifice she is making for Jansson, and the reactions of Kanning and Lidman.
The original production in Sweden premiered on February 13, 1907, at the old Royal Dramatic Theatre featuring Gerda Lundequist in the title role.