EN Koga Station (古河駅 Koga-eki) is a railway station on the Tōhoku Main Line in Koga, Ibaraki, Japan, operated by East Japan Railway Company (JR East).

ES Koga (古河市 Koga-shi?) es una ciudad situada en la Prefectura de Ibaraki, en Japón.

EN The Koga Domain (古河藩 Koga-han) was a Japanese domain of the Edo period, located in Shimōsa Province (present-day Koga, Ibaraki).