| Ishikari Bay | |
| Pushpin Map: | Japan Hokkaido |
| Coords: | 43.3333°N 148°W |
| Rivers: | Ishikari, Shinkawa, Hoshioki |
| Oceans: | Sea of Japan |
| Countries: | Japan |
| Max-Depth: | 5000NaN0[1] |
| Cities: | Otaru, Ishikari, Shakotan, Furubira, Yoichi |
is a bay located in Hokkaido of Japan, connected to the Sea of Japan. Ishikari Bay is the area east of the straight line from Cape Shakotan on the west of Shakotan Peninsula to Cape Ofuyu.
Ishikari, Shinkawa, Hoshioki, etc.
In Hokkaido, important ports are located in Ishikari Bay. The and the .
In addition to a small array of onshore wind turbines, in late 2023 the New Port became host to the Ishikari Bay New Port Offshore Wind Farm, at the time the largest offshore wind farm in Japan.