Orkjärve Bog is a bog in Estonia, Harju County, Nissi Parish.
It is situated in the territories of Aude, Jaanika and Tabara villages.
Bog area is 3281 ha.
In the northern part of bog there is Lake Laanemaa (also known as Orkjärv).
Peat deposit is up to 3.5 m.
It is part of Orkjärve Nature Reserve.