Lina Loos (née Carolina Catharina Obertimpfler; 9 October 1882, in Vienna – 6 June 1950, in Vienna) was an Austrian cabaret actress and feuilleton journalist.

She is best remembered for her appearances at the Linden-Cabaret in Berlin, and for her posthumous collection of writings edited by Adolf Opel.

[4][5] In July 1902, she married architect Adolf Loos, who was twelve years her senior in Eisgrub.

[7] Lang had hoped Loos would break up with her husband and travel to him, but she wrote to him that she had changed her mind and refused to come.

[5] Loos died on 6 June 1950 at Vienna General Hospital aged 67, after suffering from cancer.