Ousdale Burn Broch near Helmsdale in Sutherland will be conserved and turned into a visitor attraction after a grant of £180,000 was secured.
The money was won by Caithness Broch Project, which works to highlight the history of these mysterious towers.
The Caithness Broch Project said the broch had fallen into a poor state of repair after a wall collapsed near the front of the structure and a tree started growing inside.
"I think it will become a big attraction not just for visiting tourists but for regular users of the A9 from Inverness to Caithness who will have passed by many times without realising what a special place it is.”
Earlier excavations of the broch found evidence of metalworking, animal bones including those of sheep, deer, ox and hare and large quantities of native pottery including pieces of vase made from hard grey clay.
Funding for the conservation work was secured from a local windfarm fund, Historic Environment Scotland and Highland LEADER.
Caithness Broch Project have been promoting the brochs of Caithness since 2013.
Its flagship project is the construction of a replica broch, which will serve as visitor attraction and support the diversification of the Caithness economy, in which tourism is already playing an increasing and important role.