Agonum darlingtoni, also known as Darlington's harp ground beetle, is a species of ground beetles, family Carabidae. It is named after P. Jackson Darlington Jr. It occurs in the northeastern North America in the Northeastern United States and Eastern Canada.
Agonum darlingtoni measures in length. It is black in coloration with iridescent and striated elytra; the eight stria are deeply impressed.
It is associated with wet habitats and likely overwinters as an adult.