No constellations start with the letter Y. The modern night sky holds 88 officially recognized constellations, and not a single one of their names begins with this letter. This gap stands out because most letters of the alphabet anchor at least one constellation, yet Y, along with a few others, remains completely empty.

The reason traces back to how constellation names were formed. Most of these names come from Latin and ancient Greek, and they describe mythological figures, animals, or objects that early astronomers imagined among the stars. Names like Orion, Andromeda, and Scorpius reflect that classical heritage. The letter Y is rare in Latin and was mainly used to spell words borrowed from Greek, so very few candidate names ever started with it. When the International Astronomical Union set the final list of 88 constellations in 1922 and fixed their boundaries in 1930, no Y name made the cut.

If you are looking for star patterns tied to the letter Y, a couple of related options come close. Vela, Vulpecula, and Virgo sit nearby in the alphabet and carry the kind of classical names you might expect. There is also the Y-shaped asterism in Virgo, a recognizable pattern of stars that forms the rough shape of the letter, though an asterism is an informal grouping rather than an official constellation. For a true constellation beginning with Y, however, the sky simply does not offer one.