Musashiseki Park, Urban park in Sekimachi-Kita, Tokyo, Japan.

Musashiseki Park is a ward-run park in Sekimachi-Kita, Tokyo, centred on Fujimi Pond, a spring-fed pond fed by groundwater from the Musashino Terrace. The pond, elongated north to south, has two uninhabited islets, Matsu-no-Shima at the north end and Ashi-no-Shima at the south, linked by the Naka-no-hashi bridge. The Shakujii River runs along the pond's southern edge, and the pond doubles as a flood-control basin.

The site opened in the Taishō era as Wakamiya Playground, a private park named after the nearby Wakamiya Shrine, with playground equipment installed. In 1935 Tokyo City made it part of its park development programme, budgeting 41,000 yen to lay out about 17,600 tsubo, including a 7,000-tsubo pond, and it was already called Musashi-Seki Park. In October 1938 the Musashino Railway and a park construction association donated roughly 14,000 tsubo, and the park passed to Tokyo City; in April 1978 it was transferred from Tokyo Metropolis to Nerima Ward.

The park is known for its spring cherry blossom gatherings, when hundreds of trees bloom and neighbors come here to celebrate the season together. These occasions bring people outside to walk and rest beneath the flowering branches.

The park is easy to reach, as Higashi-Fushimi Station is about five minutes away on foot. Visitors can find plenty of seating and walking paths, making a relaxed visit possible throughout the year.

Fujimi Pond is fed by natural springs from the Musashino Terrace, connecting it to other notable parks like Shakujii and Inokashira in Tokyo. This geological link makes the site part of a larger natural landscape shared across the city.