Inage Seaside Park, Seaside recreational area in Mihama-ku, Japan.

Inage Seaside Park is an urban park facing Tokyo Bay in Chiba City, covering about 83 hectares along roughly 3 km of coastline. Its artificial beach, Inage-no-hama, opened in 1976 as Japan's first man-made bathing beach, 1,200 m long and 200 m wide. The grounds also hold the Inage Memorial Hall with a 300-degree observation room, the Chiba City Flower Museum, a yacht harbour, sports fields and an open-air stage.

The park opened in 1977 as a recreational development for the region. A beach section was later renewed to address erosion damage from natural forces.

The black pines of Isono Matsubara were planted in 1980 for the city's 60th anniversary: 60,000 seedlings funded by donations from 6,000 residents, who did the planting themselves. The grove was named Isono Matsubara and selected for Japan's 100 Best White Sand and Green Pines in 1987. Nearby, the tea house Kaiseian in the Japanese garden hosts tea ceremonies.

The park has accessible facilities and marked parking areas for visitors. The nearby JR Inage Kaigan Station makes it easy to reach by public transport.

The park features an open-air concert venue that hosts music and cultural events for the community. From elevated viewpoints, visitors can enjoy views across the bay toward the city skyline on clear days.