John Hancock Klippart (1823–1878) was an American agriculturist and expert on wheat farming.

[1] He worked for the Ohio State Board of Agriculture and has been described as the most "informed individual" of his time on wheat culture.

He published a large book in 1858 documenting information about wheat plants and farming.

[2] Klippart was an early evolutionary thinker to have mentioned the concept of natural selection.

[3] According to science historian Conway Zirkle, "In 1858, Klippart showed how nature could displace one variety or species of wheat by another.