Newtonia

Newtonia could refer to:
 * Newtonia, Cheshire, England
 * Newtonia, Missouri, a town in Missouri, USA
 * Newtonia (bird), a genus of vangas, passerine birds endemic to Madagascar
 * Newtonia (plant), a genus of flowering plants in the family Fabaceae
 * 662 Newtonia, a minor planet