joy may refer to the following:

• Egg (biology), an ovum together with its shell or outer layer, internal membranes and nutrients for the embryo.
• Egg cell or ovum, a haploid female reproductive cell or gamete.
• Egg tooth, a temporary pointed hard anatomical structure, used by a baby creature when hatching to break its eggshell.

• Egg (food), usually chicken eggs, but also those of other birds and turtles, as well as those of fish
• Chocolate egg, a confectionery made primarily of chocolate often associated Easter, the Easter Bunny and Easter Eggs

• Egg Island, Bahamas
• Egg, Switzerland, a Swiss municipality
• Egg an der Günz, a municipality in Bavaria, Germany
• Little Egg Harbor
• Egg, Austria
• The Egg (building), a part of the Empire State Plaza

• Egg (album), Egg's debut album
• Egg (band), an English progressive rock band
• Egg (electronic music producers), a Canadian electronic music duo
• Eggs (band), an American indie-pop band
• The Egg (funk band), a British electronic funk band
• Mr Egg, acid house musician

• Augustus Egg, a Victorian artist
• Oval, any curve resembling an egg or an ellipse
• An egg, a word for a type of sewing tool, used for darning
• Fabergé egg, a collection of priceless jewelery eggs
• Love egg A female sex toy with the shape of an egg
• EG&G, a U.S. defense contractor
• Egg Banking plc, an online bank in the United Kingdom
• Eggs (film), a film by Norwegian director Bent Hamer
• Egg (magazine), a Japanese magazine
• EGG, the Arts Show, a former program on PBS
• The Egg War an 1863 conflict between rival egging companies on the Farallon Islands
• EGG may stand for electrogastrogram, which records the electrical activity of the stomach muscles during peristalsis
• Elemental Gimmick Gear, a Sega Dreamcast game
• World egg (or cosmic egg), a mythological motif