Hanasaari (Swedish: Hanaholmen) is a neighbourhood in the district of Sörnäinen in Helsinki, Finland, between the neighbourhoods of Vilhonvuori, Kalasatama and Sompasaari near Merihaka. The name comes from an island that was lost under reclaimed land. Hanasaari has primarily been a power plant area, although the plant has already been shut down. The first power plant was built next to Hanasaari in Suvilahti.