Rashfield is a hamlet on the Cowal peninsula, situated between Loch Eck and the head of Holy Loch, in Argyll and Bute, Scotland. The hamlet is on the A815 road and the River Eachaig flows past from Loch Eck to the Holy Loch. Rashfield is within the Argyll Forest Park, which is itself within the Loch Lomond and The Trossachs National Park.
Rashfield Primary School was closed in 1998. Pupils now travel to Sandbank Primary.