Sarah Amherst, Countess Amherst (née Archer, later Sarah Windsor, Countess of Plymouth; 1762–1838), credited as Sarah Amherst, was a British naturalist and botanist who lived in India.

She identified several species which were named after her, including a species of pheasant (Chrysolophus amherstiae) and a flowering tree (Amherstia nobilis).

[1][2][3] Her parents were Andrew Archer, 2nd Baron Archer, and Sarah West, daughter of James West.

She was married to her first cousin Other Windsor, 5th Earl of Plymouth, from 1778 until his death in 1799.

This article about a British botanist is a stub.