Butler's Rangers (1777–1784) was a Loyalist provincial military unit of the American Revolutionary War, raised by American loyalist John Butler. Most members of the regiment were Loyalists from upstate New York. Their winter quarters were constructed on the west bank of the Niagara River, in what is now Niagara-on-the-Lake, Ontario. The Rangers fought principally in Western New York and Pennsylvania, but ranged as far west as Ohio and Michigan and as far south as Virginia.