The dulzaina or dolçaina is a Spanish double reed instrument in the oboe family. It has a conical shape and is the equivalent of the Breton bombarde. It is often replaced by an oboe or a double reeded clarinet as seen in Armenian and Ukrainian folk music.

A double reed is a type of reed used to produce sound in various wind instruments. In contrast with a single reed instrument, where the instrument is played by channeling air against one piece of cane which vibrates against the mouthpiece and creates a sound, a double reed features two pieces of cane vibrating against each other. This means, for instruments with the double reed fully exposed, that the air flow can be controlled by the embouchure from the top, bottom and sides of the reed. The term double reeds can also refer collectively to the class of instruments which use double reeds.