dulcian

thumb|upright|Dulcian, 1700, Museu de la Música de Barcelona thumb|Dulcians in Theatrum Instrumentorum (Michael Praetorius, 1620) The dulcian is a Renaissance woodwind instrument, with a double reed and a folded conical bore. Equivalent terms include , , , , , , and .

The predecessor of the modern bassoon, it flourished between 1550 and 1700, but was probably invented earlier. Towards the end of this period it co-existed with, and was then superseded by, the baroque bassoon. It was played in both secular and sacred contexts, throughout northern and western Europe, as well as in the New World.