Hitachi Seaside Park (国営ひたち海浜公園, Kokuei Hitachi Kaihinkōen) is a public park in Hitachinaka, Ibaraki, Japan.

Covering an area of 190 hectares, the park features blooming flowers around the year.

[1] The park has become known for its baby blue-eyes flowers, with the blooming of 4.5 million of the translucent-petaled blue flowers in the spring drawing tourists.

In addition to the annual "Nemophila Harmony", the park features a million daffodils, 170 varieties of tulips, and many other flowers.

Hitachi Seaside Park previously hosted the Rock in Japan Festival, held in August every year.