Japan Diamond Softball League
| Current season, competition or edition: 2023 JD.League season | |
| Formerly | Japan Softball League (1968–2021) |
|---|---|
| Sport | Softball |
| First season | 2022 |
| No. of teams | 16 |
| Country | Japan |
| Confederation | WBSC Asia |
| Most recent champion | Toyota Red Terriers (3rd title) |
| Most titles | Toyota Red Terriers (3 titles) |
| Official website | jdleague |
The Japan Diamond Softball League (JD.League) is a Japanese women's softball league that consists of 16 teams (8 in the East Division and 8 in the West Division). The league is the premier women's softball league in the country. The league was formed in 2022 and is headquartered in Shinjuku, Tokyo.
The JD.League is a member of the Japan Top League Alliance, which comprises the top-tier sports leagues in Japan. Nitori entered into the title partnership with the JD.League, and thus the league is officially called Nitori JD.League.