Ellisif Ranveig Wessel, née Müller (14 July 1866 – 28 November 1949) was a Norwegian writer, trade unionist and politician for the Labour Party.
[1] She was born in Østre Gausdal Municipality as a daughter of district physician Wilhelm Jacobi Müller (1830–1909) and Hansine Pauline Ross (1830–1907).
In March 1886 in Dovre Municipality she married her first cousin Andreas Wessel (1858–1940), a newly educated physician.
Her documentation of the Sami culture, among others in the 1902 book Fra vor grændse mod Rusland, has been deemed "invaluable".
She translated revolutionary literature from Russian and German, and in 1906 she was a driving force in founding the local trade union, Nordens Klippe where she became both secretary and treasurer.