Koidu (disambiguation)

Koidu is a city in Sierra Leone.

Koidu may also refer to one of several villages in Estonia:
 * Koidu, Harju County, village in Saue Parish, Harju County
 * Koidu, Lääne County, village in Haapsalu, Lääne County
 * Koidu, Viljandi County, village in Viljandi Parish, Viljandi County