Knightia is an extinct genus of clupeid bony fish that lived in the freshwater lakes and rivers of North America and Asia during the Eocene epoch.

The genus was erected by David Starr Jordan in 1907, in honor of the late University of Wyoming professor Wilbur Clinton Knight, "an indefatigable student of the paleontology of the Rocky Mountains.

[4] In a 2022 paper, researchers announced they had detected biological residues in Knightia fossils from the Green River Formation.

[7] The age of "K." yuyanga has been revised with the placement of the species' type locality in the Late Cretaceous Paomagang Formation.

[10] In Knightia fish, rows of dorsal and ventral scutes run from the back of the head to the medial fins.