狭叶泥炭藓（学名：Sphagnum cuspidatum）为泥炭藓科泥炭藓属下的一个种。

Sphagnum cuspidatum, the feathery bogmoss, toothed sphagnum or toothed peat moss, is a peat moss found commonly in Great Britain, Norway, Sweden, the eastern coast of the United States, and in Colombia.