Fiddleheads or fiddlehead greens are the furled fronds from a fledgling fern, harvested for use as a vegetable.

The ferns are a group of vascular plants that reproduce via spores and have neither seeds nor flowers. They differ from non-vascular plants by having specialized transport bundles that conduct water and nutrients from and to the roots, as well as life cycles in which the branched sporophyte is the dominant phase.