There is little evidence explaining the motive for the earliest mask wearing in Venice. One scholar argues that covering the face in public was a uniquely Venetian response to one of the most rigid class hierarchies in European history. During Carnival, the sumptuary laws were suspended, and people could dress as they liked, instead of according to the rules that were set down in law for their profession and social class.
Five women appear in open windows in an upper floor; five men stand on the ground. Two men are carrying egg baskets; one man passes an egg to another, who prepares to throw it at the women Masked men threw eggshells filled with perfume during carnial.
The first documented sources mentioning the use of masks in Venice can be found as far back as the 13th century. The Great Council made it a crime for masked people to throw scented eggs. These ovi odoriferi were eggshells that were usually filled with rose water perfume, and tossed by young men at their friends or at young women they admired. However, in some cases, the eggs were filled with ink or other damaging substances. Gambling in public was normally illegal, except during Carnival. The document decrees that masked persons were forbidden to gamble.
Another law in 1339 forbade Venetians from wearing vulgar disguises and visiting convents while masked. The law also prohibited painting one's face, or wearing false beards or wigs.
Near the end of the Republic, the wearing of the masks in daily life was severely restricted. By the 18th century, it was limited only to about three months from December 26. The masks were traditionally worn with decorative beads matching in colour.
Masquerade masks were worn by the prosperous class at balls. Masquerade masks had many uses including hiding one's identity, expressing one's freedom of speech, and voicing one's emotions and opinions without judgement. There were two types of base masquerade masks; black masks and white masks. Designs and patterns were created over the base that was chosen. The main types of masks included masks with a stick, the head mask, the full-face mask, and the half face mask. From classics like The Phantom of the Opera and Romeo and Juliet to The Lone Ranger and Gossip Girl, masquerade masks have been, and are still used in many types of media today.

The bauta (sometimes referred as ba?tta) is a mask, today often heavily gilded though originally simple stark white, which is designed to comfortably cover the entire face; this traditional grotesque piece of art was characterized by the inclusion of an over-prominent nose, a thick supraorbital ridge, a projecting "chin line", and no mouth. The mask's beak-like chin is designed to enable the wearer to talk, eat, and drink without having to remove it; thereby, preserving the wearer's anonymity. The bauta was often accompanied by a red or black cape and a tricorn. In the 18th century, together with a black cape called a "tabarro", the bauta had become a standardized society mask and disguise regulated by the Venetian government. It was obligatory to wear it at certain political decision-making events when all citizens were required to act anonymously as peers. Only citizens (i.e., men) had the right to use the bauta. Its role was similar to the anonymizing processes invented to guarantee general, direct, free, equal and secret ballots in modern democracies. Also, the bearing of weapons along with the mask was specifically prohibited by law and enforceable by the Venetian police. Given this history and its grotesque design elements, the bauta was usually worn by men, but many paintings done in the 18th century also depict women wearing this mask and tricorn hat. The Ridotto and The Apple Seller by Pietro Longhi are two examples of this from the 1750s.

The Colombina (also known as Columbine and as a Colombino) is a half-mask, only covering the wearer's eyes, nose, and upper cheeks. It is often highly decorated with gold, silver, crystals, and feathers. It is held up to the face by a baton or is tied with ribbon as with most other Venetian masks. The Colombina mask is named after a stock character in the Commedia dell'arte: Colombina was a maidservant and soubrette who was an adored part of the Italian theatre for generations. It is said it was designed for an actress because she did not wish to have her beautiful face covered completely. In fact, the Colombina is entirely a modern creation. There are no historic paintings depicting its use on the stage or in social life.
While both men and women now wear this mask, it began as a woman's analog to the bauta.

The Medico della peste, with its long beak, is one of the most bizarre and recognizable of the Venetian masks, though it did not start out as carnival mask at all but as a method of preventing the spread of disease. The striking design originates from 17th-century French physician Charles de Lorme who adopted the mask together with other sanitary precautions while treating plague victims. The mask is often white, consisting of a hollow beak and round eyeholes covered with crystal discs, creating a bespectacled effect. Its use as a carnival mask is entirely a modern convention, and today these masks are often much more decorative. Although the mask and costume is worn almost exclusively by males, the enhancement in decoration also suggests that women are now more likely to wear the mask and costume than in previous years at the Carnival.
The plague doctors who followed De Lorme's example wore the usual black hat and long black cloak as well as the mask, white gloves and a staff (so as to be able to move patients without having to come into physical contact with them). They hoped these precautions would prevent them contracting the disease. The mask was originally beaked with a purpose in congruence with the miasmatic theory of disease practiced at that time: the hollow beak allowed for the containment of flowers and other sweet-smelling substances designed to keep away the foul odors that were thought to spread infection. Those who wear the plague doctor mask often also wear the associated clothing of the plague doctor. The popularity of the Medico della peste among carnival celebrants can be seen as a memento mori.

The moretta (meaning dark one) or servetta muta (meaning mute servant woman) was a small strapless black velvet oval mask with wide eyeholes and no lips or mouth worn by patrician women. It derived from the visard mask invented in France in the sixteenth century, but differed in not having a hole to speak through. The mask was only just large enough to conceal a woman's identity and was held in place by the wearer biting on a button or bit (the women wearing this mask were unable to speak, hence muta) and was often finished off with a veil. The Rhinoceros by Pietro Longhi, sometimes called Clara the rhinoceros, depicts this mask in use in 1751. It fell into disuse about 1760.

The volto (Italian for face) or larva (meaning ghost in Latin) is the iconic modern Venetian mask: it is often made of stark white porcelain or thick plastic, though also frequently gilded and decorated, and is commonly worn with a tricorn and cloak. The "volto" is also quite heavier than a typical mask and has a much tighter fit; many people who experience claustrophobia do not wear the "volto" at the Carnival. If worn by a woman, who are the most common wearers of the volto at the modern festival, it is typically worn with a headdress, scarf, veil, another mask, or a combination of all four. It is secured in the back with a ribbon. Unlike the moretta muta, the volto covers the entire face of the wearer including the whole of the chin. Unlike a typical mask, it also extends farther back to just before the ears and upwards to the top of the forehead; also unlike the moretta muta, it depicts the nose and lips in simple facial expressions. Unlike the bauta, the volto cannot be worn while eating and drinking because the coverage of the chin and cheeks is too complete and tight (although the jaw on some original commedia masks was hinged, this is not a commedia mask and so is never hinged the lips are always sealed).

Another classic character from the Italian stage, Pantalone, possibly stemming from the Italian "pianta il leone" referencing the conquests of Venice and the origin of this character, is usually represented as a sad old man with an oversized nose like the beak of a crow with high brows and slanted eyes (meant to signify intelligence on the stage). Like other commedia masks, Pantalone is also a half mask. This mask is almost exclusively worn by men, although its popularity at the modern festival has declined.

Arlecchino, meaning harlequin in Italian, is a zanni character of the commedia. He is meant to be a kind of "noble savage", devoid of reason and full of emotion, a peasant, a servant, even a slave. His originally wooden and later leather half-mask painted black depicts him as having a short, blunt, ape-like nose, a set of wide, round, arching eyebrows, a rounded beard, and always a "bump" upon his forehead meant to signify a devil's horn. He is a theatrical counterpoint to and often servant of Pantalone, and the two characters often appeared together on the stage.

The Zanni class of characters is another classic of the stage. Theirs is a half mask in leather, presenting themselves with low forehead, bulging eyebrows and a long nose with a reverse curve towards the end. It is said that the longer the nose, the more stupid the character. The low forehead is also seen as a sign of stupidity. The zanni are often the supporting characters in a commedia performance, often fulfilling similar societal roles as Arlecchino, though with smaller parts