Hobart Bay is a census-designated place located in Hoonah-Angoon Census Area, Alaska. As of the 2010 Census, the population of the CDP was one. The bay was named in 1889 by Lt. Commander Mansfield of the U. S. Navy. The site was first settled as a logging camp. The population has declined in recent years and it would probably not be incorporated as a town with the present population.
According to the United States Census Bureau, the CDP has a total area of 129.8 square miles (336 km sq), of which, 117.4 square miles (304 km sq) of it is land and 12.4 square miles (32 km sq) of it is water. The total area is 9.54% water.