East Frisian (also East Friesian) is an adjective referring to East Frisia, a region in Germany. It can refer specifically to:

East Frisians, the people from the region East Friesian (sheep), a breed of sheep originating there East Frisian Islands, off the coast of East Frisia East Frisian Low Saxon, the Low German dialect spoken there Ostfriesen and Alt-Oldenburger, a breed of horse originating there East Frisian language, a language historically spoken in Saterland

See also Frisian (disambiguation)