Esox (Linnaeus, 1758) is a genus of freshwater fish, a member of the pike family (family Esocidae) of order Esociformes as is the Muskellunge. The type species is E. lucius, the northern pike. The species of this genus are known as the pikes.

The pike species are native to the Palearctic and Nearctic ecozones, ranging across northern North America and from Western Europe to Siberia in Eurasia.

Pikes can grow to a maximum recorded length of 1.83 metres (6 ft), reaching a maximum recorded weight of 35 kilograms (77 lb). Individuals have been reported to reach 30 years in age. They have the elongated, torpedo-like form of predatory fishes, with sharply-pointed heads and sharp teeth. Their coloration is typically grey-green with a mottled or spotted appearance. The pike's marking is like a finger print, each with different patterns.