Elsa Sigrid Collin (3 October 1887 – 29 June 1941) was a Swedish theatre critic, poet and actress.

[2][3] Collin was also active in the left-wing fraternity Den yngre gubben and wrote for the student paper with, among others, Vilhelm Ekelund, with whom she had a close relationship at the time.

[1] Collin published poetry in the Social Democratic women's magazine Morgonbris, including two overtly political poems, "Det dagas" (Day is dawning) and "Giv ditt namn!"

[1] During her years in Stockholm, Collin became a close friend of writer and theatre leader Brita von Horn; the two women shared a residence in Skagen.

[1] However, the piece did not receive its first performance until 1944, after Collin's death, when it was also Ingmar Bergman's inaugural production at the Helsingborg City Theatre.