Perry or pear cider is an alcoholic beverage made from fermented pears, traditionally in England (particularly Gloucestershire, Herefordshire, and Worcestershire), parts of South Wales, France (especially Normandy and Anjou), Canada, Australia, and New Zealand. There is growing interest in artisanal perry production in the fruit-growing regions of the northwest United States. Perry typically has an alcohol content ranging from 5% to 8% ABV, but is sometimes distilled into Calvados with 40-43% ABV, and blended with further pear juice to produce a fortified drink of around 17% ABV.

The pears used to make perry are typically not the large, sweet varieties eaten as fresh fruit. Perry pears tend to be small and relatively bitter — the distinction between table pears and perry pears is similar to the distinction between table apples and cider apples. Perry pears are thought to be descended from wild hybrids, known as wildings, between the cultivated pear Pyrus communis subsp. communis and the now-rare wild pear Pyrus communis subsp. pyraster. The cultivated pear P. communis was brought to northern Europe by the Romans. In the fourth century CE Saint Jerome referred to perry as piracium. Wild pear hybrids were, over time, selected locally for desirable qualities, and, by the 1800s, many regional varieties had been identified.

The majority of perry pear varieties in the UK originate from the counties of Gloucestershire, Herefordshire, and Worcestershire in the West Midlands; perry from these counties made from traditional recipes now forms a European Union Protected Geographical Indication. Of these perry pear varieties, most originate in parishes around May Hill on the Gloucestershire/Herefordshire border. The standard reference work on perry pears was published in 1963 by the Long Ashton Research Station; since then, many varieties have become critically endangered or lost. Over 100 varieties, known by over 200 local names, were in Gloucestershire alone. These local pears are particularly known for their picturesque names, such as the various "Huffcap" varieties ('Hendre Huffcap', 'Red Huffcap', 'Black Huffcap', all having an elliptical shape), those named for the effects of their product ('Merrylegs', 'Mumblehead'), pears commemorating an individual ('Stinking Bishop', named for the man who first grew it, or 'Judge Amphlett', named for Assizes court judge Richard Amphlett), or those named for the place they grew ('Hartpury Green', 'Bosbury Scarlet', 'Bartestree Squash'). The perry makers of Normandy grew their own distinctive varieties such as Plant de Blanc, Antricotin and Fausset; the perry of Domfront, which has been recognised with AOC status since 2002 and PDO status since 2006, must be made with a minimum of 40% Plant de Blanc.

Pear cultivars used for perry-making tend to be small in size, turbinate or pyriform in shape, and too astringent for culinary use.} Specific perry pear cultivars are regularly used to make single-variety perries; this was formerly the usual practice in traditional perry making, meaning that in the past, each parish would have produced its own characteristic and distinctive perries due to the very restricted distribution of many varieties. Blended perries, made from the juices of several varieties, were traditionally disregarded as they tended to throw a haze, though in modern commercial production, this is overcome with filtration and use of a centrifuge.

Good perry pears should have higher concentrations of tannins, acids, and other phenolic compounds. Some of the pears considered to produce consistently excellent perry include the 'Barland', 'Brandy', 'Thorn,' and 'Yellow Huffcap' cultivars. Compared to cider apples, perry pears have fewer volatile components and consequently fewer aromatics in the finished product. Their tannin profile is very different from that of cider apples, with a predominance of astringent over bitter flavours. They do, however, contain a high concentration of deca-2,4-dienoate, a group of esters that affords them their prominent pear aroma. Another important attribute of perry pears that distinguishes them from cider apples is their relatively higher content ratio of sorbitol to other sugars, such as fructose. Because sorbitol is not readily fermented by yeast, it is not converted to ethanol, so perry tends to have more residual sugar than cider produced from the fermentation of apples. In addition to producing a sweeter beverage, sorbitol also contributes to increased body and a softer mouthfeel in the finished perry. Compared to apples, pear pressing is made more difficult by the additional presence of specialized cells known as sclereids, which have thick cell walls that provide extra support and strength to the pear tissue. Because of this inherent perry pear attribute, the addition of enzymes and pressing aids is a commonly used practice for improving perry production.

While cultivation of pears has been to some extent modernised, they remain a difficult crop to grow. Perry pear trees can live to a great age, and can be fully productive for 250 years. Pear trees, both domestic and perry varieties, grow incredibly slowly, taking up to, if not over, a decade before they bear enough fruit for harvest. They also grow to a considerable height and can have very large canopies; the largest recorded, a tree at Holme Lacy, which still partly survives, covered three-quarters of an acre and yielded a crop of 5–7 tons in 1790. Given the long maturing period of pear trees, they can be difficult to manage against diseases. Their size makes it difficult to apply pesticides, which makes preventing fire blight, a disease caused by the bacterium Erwinia amylovora that pears are even more susceptible to than cider apples, quite challenging. These difficulties, along with demand for perry pears having (until recently) taken a decline, have prompted a national collection of perry pear cultivars to be gathered, housed, and cared for at the Three Counties Agricultural Showground at Malvern in Worcestershire, to maintain genetic resources, which has now become the National Perry Pear Centre at Hartpury. Similar germplasm repositories can be found at the National Clonal Germplasm Repository in Corvallis, Oregon.

Also, key differences between cider and perry production exist in the harvesting and growing processes. Perry trees famously take more time to mature than cider trees. While cider trees may come to bear fruit in three to five years, traditionally managed perry trees typically take much longer, so much so that people say that one plants "pears for your heirs".

Even when fully grown, pear trees bear less fruit than apples, which is one reason that perry is less common than cider. When time to harvest comes, pears should be picked before they are ripe and then left to ripen indoors, while apples should be allowed to ripen on the tree. Both apples and pears suffer from fire blight, which can devastate entire orchards, but pears are also susceptible to pear psylla (also known as Psylla pyri). These insects kill the entire pear tree and are very resistant to insecticides, making them a severe problem for pear orchards. Another added complication is that while apples are often harvested mechanically, pears must be harvested by hand, greatly increasing the time and cost of harvesting.