Hitachi Seaside Park is a public park in Hitachinaka, Ibaraki, Japan.
Covering an area of 190 hectares, the park features blooming flowers around the year. 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. The park includes cycling trails and a small amusement park with a Ferris wheel.