Peter Sherlock Wyse Jackson (born 7 June 1955) is an Irish botanist and environmentalist.

He is president of the Missouri Botanical Garden, and holder of the George Engelmann chair in botany at Washington University in St. Louis.

[4][5] Wyse Jackson was educated at Trinity College Dublin, where he took a BA and an MA in botany, and a PhD for work related to the taxonomy of the Cruciferae of Ireland.

[7][8] Wyse Jackson left Trinity in 1987 and joined the International Union for Conservation of Nature at Kew[clarification needed], in south-west London.

Concurrently with his selection as President of the Missouri Botanical Garden, he was named the George Engelmann Professor of Botany at Washington University in St. Louis.