Kapaʻa (Kauaʻi dialect: Tapaʻa), also spelled Kapaa, is an unincorporated community and census-designated place (CDP) in Kauaʻi County, Hawaiʻi, United States.

Notable people from Kapaʻa include Lokalia Montgomery.

Hawaii Route 56 passes through the eastern part of the community, leading north 6 miles (10 km) to Anahola and south 8 miles (13 km) to Lihue.

There were 3,632 housing units at an average density of 372.4 per square mile (143.8/km2).

About 14.1% of families and 15.7% of the population were below the poverty line, including 18.6% of those under 18 and 12.6% of those 65 or older.