Sarah Greenwood (née Field; c. 1809 – 13 December 1889) was a New Zealand artist, letter-writer and teacher.

Her letters and drawings of her experiences depict pioneer life in Nelson, where she lived for 46 years.

Greenwood was born in Lambeth, Surrey, England, in about 1809; she was the daughter of Mary Ann Jones and John Field.

[4][5] The family lived in London, England, and Charenton-le-Pont, near Paris, France, before emigrating to New Zealand in 1843.

Greenwood's husband had worked as ship's surgeon superintendent on the Phoebe en route to New Zealand in exchange for free passage for his family.