Rosa Emilia Lemberg (née Clay; 31 August 1875 – 1959) was a Namibian-born Finnish American teacher, singer and choral conductor.

[1] At the age of 19 she graduated from her seminary in Sortavala, where she was especially successful in art subjects, led the school choir, and often sang solo parts in concerts.

[12] On the west coast, Lemberg joined the syndicalist Industrial Workers of the World trade union, in which she was later particularly active as a theater director.

[7] In 1919, Lemberg moved to Chicago, where she continued her activities in the IWW union and the local Finnish-American gathering place, Finn Hall.

[1] Lemberg worked as a choir and theater director and appeared in leading roles in numerous operettas and musical plays in addition to regular drama.

[7] In addition to her long-time hometown of Chicago, Lemberg had a great influence in the community and cultural life of Finnish-American socialists in Astoria, Oregon.

[12] Due to her influence, the repertoire of the local theater included works by, among others, Henrik Ibsen and Molière, in addition to well-known Finnish plays.

[3] In 1993, another biography called The Rosa Lemberg story, written by Eva Helen Erickson, was published by Työmies Society.

[1] In 2010, Lemberg's life was discussed in the television documentary series Afro-Suomen historia ("The Afro-Finnish History"), presented by Yle Teema.