Ellen Gyrithe Lemche née Frisch (1866–1945) was a Danish writer, women's rights campaigner and local historian.

[3] Ellen Gyrithe spent her early years in Copenhagen's Store Kongensgade before moving with her family to Lyngby where her maternal grandparents lived.

[1] Her first book, the semi-biographical novel Soedtmanns Jomfruer, portrays the history of the inhabitants of Lyngby, including her relatives, from medieval times to the present.

In 1910, Lemche was appointed to the board and under Astrid Stampe Feddersen's presidency from 1913 to 1918 became the organization's most active ideologist and effective leader.

Although she retired from the presidency of the Women's Society in 1918, to be replaced by Julie Arenholt, she remained active in the organization, becoming an honorary member in 1944.