Chūō-ku is one of the three wards of Hamamatsu, Shizuoka, Japan, located in the south part of the city. It encompasses the site of Hamamatsu Castle, Lake Hamana and Hamamatsu Station, the central business and residential district. Although its area is the smallest of the three wards of Hamamatsu, it has by far the largest population. It is bordered by Hamana-ku, Kosai, Shizuoka, and Iwata, Shizuoka.