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A wine glass is a type of glass stemware that is used to drink and taste wine. It is generally composed of three parts: the bowl, stem, and foot. Selection of a particular wine glass for a wine style is important, as the glass shape can influence its perception.

The appropriate way to hold a wine glass, especially when drinking chilled wine, is to grasp it by the stem, in order to prevent the temperature of the wine being affected by body heat.

High quality wine glasses once were made of lead crystal, which has a higher index of refraction and is heavier than ordinary glass, but health concerns regarding the ingestion of lead resulted in their being replaced by lead-free crystal. Wine glasses, with the exception of the hock glass, are generally not coloured or frosted as doing so would diminish appreciation of the wine's colour.

The effect of glass shape on the taste of wine has not been demonstrated by any scientific study and remains controversial. It is however believed by some that the shape of the glass is important, as it concentrates the flavour and aroma (or bouquet) to emphasize the varietal's characteristic. One common belief is that the shape of the glass directs the wine itself into the best area of the mouth from the varietal. This is based on false ideas about the nature of taste buds on the tongue, such as the thoroughly discredited tongue map.

Generally, the opening of the glass is not wider than the widest part of the bowl.

Most wine glasses have stems, although "stemless" wine glasses are now available in a variety of sizes and shapes as well. These glasses are typically used more casually than their traditional counterparts, as they negate the benefits of using stemmed wine glasses.

Most common wine glasses can be divided into three types: red wine glasses, white wine glasses and champagne flutes. Wine tumblers (without stems) are also increasing in popularity.

Glasses for red wine are characterized by their rounder, wider bowl, which increases the rate of oxidation. As oxygen from the air chemically interacts with the wine, flavor and aroma are believed to be subtly altered. This process of oxidation is generally considered more compatible with red wines, whose complex flavours are said to be smoothed out after being exposed to air. Red wine glasses can have particular styles of their own, such as

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