Bertha Carolina Mathilda Tammelin, née Bock (21 March 1836 – 2 January 1915) was a Swedish actress, operatic mezzo-soprano, pianist, composer and drama teacher.

As an actress, her most noted part was Ingrid in Bröllopet på Ulvåsa by Frans Hedberg, and as a singer, Puck in Oberon.

Several of her works was a part of the collection Det sjungande Europa ('The Singing Europe').

Among her famous students were Ellen Hartman and Ebba Lindkvist.

Bertha Tammelin experienced weak eyesight her entire life, and eventually, it worsened: she retired because of this condition, making her final appearance on stage on 7 March 1884.