Kenai is a city in Kenai Peninsula Borough in the U.S. state of Alaska. According to 2005 Census Bureau estimates, the population of the city is 7,464.

Kenai is located on the west side of the Kenai Peninsula near the outlet of the Kenai River to the Cook Inlet of the Pacific Ocean. According to the United States Census Bureau, the city has a total area of 35.5 square miles (92.0 km²), of which, 29.9 square miles (77.4 km²) of it is land and 5.6 square miles (14.6 km²) of it (15.85%) is water.