Selma "Selli" Engler was a leading activist of the lesbian movement in Berlin from about 1924 to 1931.

Die BIF – Blätter Idealer Frauenfreundschaften, subtitled Monatsschrift für weibliche Kultur, was a short-lived lesbian magazine of Weimar Germany, published from either 1925 or 1926 until 1927 in Berlin. Founded by lesbian activist Selli Engler, Die BIF was part of the first wave of lesbian publications in history and the world's first lesbian magazine to be published, edited and written solely by women.