John Baptist Banister (1654 – May 1692) was an English clergyman and one of the first university-trained naturalists in North America. His primary focus was botany but he also studied insects and molluscs. He was sent out as a missionary chaplain by the garden-loving Bishop Henry Compton, with whom he soon established a correspondence. Banister was first in Barbados in the West Indies and then by April 1679 in Virginia, where, while serving a rector of the parish of Charles City he became one of Bishop Compton's most energetic plant collectors, "the first Virginia botanist of any note".
Banister matriculated at Magdalen College, Oxford, where he could see and study the American plants grown from seed in the Oxford Physic Garden under the care of Dr. Robert Morison. From Virginia, his first letter to Dr Morison at the Oxford Physic Garden was dated 1679: in it he listed the bounty of American oaks that would supplement Britain's impoverished flora: dwarf, black, white, red, Spanish, chestnut, live or willow, shrubby. The historian of American gardens Ann Leighton surmises that Banister's list of Virginian timber trees provided some of the material for John Evelyn's list of desirable plants of Virginia and New England, intended to be given to a captain sailing for New England. Once settled in Virginia, where he purchased a tract of 1,735 acres (7.02 km2) on the Appomattox River in 1689/90, he established a close friendship with William Byrd of Westover, an influential Virginia planter with botanical connections in London. By 1692 Banister had become a substantial figure in Virginia, one of the founders of the College of William & Mary in Williamsburg that year; Bishop Compton was on the college's board of overseers.