Tomakomai Midorigaoka Park, sports park in Tomakomai, Japan

Tomakomai Midorigaoka Park is a park about 2 km from central Tomakomai, opened in 1964 on land the city bought in 1910. It holds an athletics stadium, tennis courts, baseball grounds, two artificial-turf football pitches, a rugby pitch, a skateboard park and a park golf course, and adjoins Takaoka Forest Park. Kintaro Pond has a paid boat rental and a rest house with barbecue space for about 140 people.

Tomakomai bought the land in 1910 from state-owned undeveloped land, and the park opened in 1964. The Highland Skating Center followed in 1967, the municipal Aurora baseball stadium in 1972, and the athletics stadium in 1981. The 1998 observation tower marked the city's 50th anniversary; the Aurora stadium closed in 2003.

The park hosts the Midorigaoka Park Festival every May, first held in 1974. Its grounds include Kintarō Pond, part of the adjoining Takaoka Forest Park, where forest bathing and nature observation are possible and boats can be rented. The park also served as a venue for speed skating at the 35th and 61st National Sports Festivals.

The park lies about 2 km from central Tomakomai and adjoins Takaoka Forest Park. The observation tower, built for the city's 50th anniversary in 1998, has a viewing room at 21.1 m, 56 m above sea level. Several sports grounds, including the youth baseball field, open only from May to October, while Shimizu Baseball Stadium operates April to October.

The observation tower opened on 6 August 1998 for the city's 50th anniversary. It is 29.6 m tall, with the observation room at 21.1 m, 56 m above sea level; construction cost about 560 million yen. The steel and partly reinforced-concrete structure has a floor area of 502.104 m².