Thina Nilsine Thorleifsen (1885–1959) was a Norwegian politician who was active in the women's movement.
She was a prominent member of Den Kvinnelige Tjenerstands Forening (The Women's Servant Class Association) from 1910 and its chair from 1915.
After the association joined the Labour Party, she became a leading member of the Norwegian Labour Party's Women's Federation from 1918, remaining in key positions until 1953.