Hyacinthus is a small genus of bulbous flowering plants in the family Asparagaceae, subfamily Scilloideae. Plants are commonly called hyacinths /ˈhaɪəsɪnθs/. The genus is native to the eastern Mediterranean (from south Turkey to northern Israel), north-east Iran, and Turkmenistan.

Several types of brodiea, squill, and other plants that were formerly classified in the lily family and have flower clusters borne along the stalk also have common names with hyacinth in them. Hyacinths should also not be confused with the genus Muscari, which are commonly known as grape hyacinths.