Ellen Sarah Greenwood (19 February 1837 – 29 November 1917) was a New Zealand teacher and social worker.

[2] In 1871, she joined her elder sister Mary in Wellington, on the Terrace, that had also set up a school.

[2] In 1883, Greenwood had closed her school in Taranaki Place and rejoined her sisters on the Terrace.

[2] The three Greenwood sisters, Ellen, Mary and Annie, retired in 1886, and they were presented with a bag of sovereigns by pupils and ex-pupils.

[2] In 1896, she was a key part in the founding of the Levin Memorial Home for Girls, Berhampore.