Ester Henriette Carstensen née Hansen (10 August 1873–12 December 1955) was a Danish women's rights activist and journal editor.

[2] From an early age, like her cousin Estrid Hein, Carstensen took a special interest in the status of women in the community.

[1] In 1906, she was a co-founder of Foreningen til Hjælp for enligtstillede (Association for Supporting Single Mothers) but went on to devote most of her time to the Danish Women's Society.

[1][2] As local branches of the Women's Society were created, Carstensen headed the Copenhagen chapter from 1913 to 1918 and later from 1934 to 1944, when she was elected honorary president for life.

An effect speaker and discussion leader, despite her aristocratic manner she was always ready to take up any aspect of work, including going out on the streets to distribute leaflets or sell the Society's marguerites.