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'''Pine nuts''' are the edible [[seed]]s of [[pine]] [[tree]]s (family [[Pinaceae]], genus ''Pinus''). About 20 species of pine produce seeds large enough to be worth harvesting; in other pines the seeds are also edible, but are too small to be of value as a human food. 

[[Image:StonePine.jpg|left|thumb|[[Stone Pine]] cone with pine nuts - note two nuts under each cone scale]]

In [[Europe]], pine nuts come from the [[Stone Pine]] (''Pinus pinea''), which has been cultivated for the nuts for over 6,000 years, and harvested from wild trees for far longer. The [[Swiss Pine]] (''Pinus cembra'') is also used to a very small extent.

In [[Asia]], two species are widely harvested, [[Korean Pine]] (''Pinus koraiensis'') in northeast Asia and [[Chilgoza Pine]] (''Pinus gerardiana'') in the western [[Himalaya]]. Four other species, [[Siberian Pine]] (''Pinus sibirica''), [[Siberian Dwarf Pine]] (''Pinus pumila''), [[Chinese White Pine]] (''Pinus armandii'') and [[Lacebark Pine]] (''Pinus bungeana'') are also used to a lesser extent.

In [[North America]] the main species are three of the [[pinyon pine]]s, [[Colorado Pinyon]] (''Pinus edulis''), [[Single-leaf Pinyon]] (''Pinus monophylla'') and [[Mexican Pinyon]] (''Pinus cembroides''). The other eight pinyon species are used to a small extent, as are [[Gray Pine]] (''Pinus sabineana''), [[Torrey Pine]] (''Pinus torreyana'') and [[Sugar Pine]] (''Pinus lambertiana'').

Pine nuts contain about 31 grams of [[protein]] per 100 grams of nuts, the highest of any nut or seed. Pine nuts have been eaten in Europe and Asia since the [[Paleolithic]] period. They are also a source of [[dietary fibre]]. Pine nuts are an essential component of [[pesto]], and are frequently added to [[meat]], [[fish]], and [[vegetable]] [[recipe|dishes]]. They are in particular used in the [[Cuisine of France|Cuisine of southwestern France]], in dishes such as the ''salade landaise''. They are also used in [[chocolate]]s and desserts such as [[baklava]].

[[Image:KoreanPineSeeds.jpg|right|thumb|[[Korean Pine]] pine nuts - unshelled, and shell, above; shelled, below]]

When first extracted from the pine [[conifer cone|cone]], pine nuts are covered with a hard shell (seed coat), thin in some species, thick in others. The nutrition is stored in the large female [[gametophytic]] tissue that supports the developing embryo ([[sporophyte]]) in the centre. Although a [[nut (fruit)|nut]] in the culinary sense, in the [[botany|botanical]] sense pine nuts are seeds; being a [[gymnosperm]], they lack a [[carpel]] (fruit) outside.

Unshelled pine nuts have a long shelf life if kept dry and refrigerated (at -5 to +2°C), but the shell must be removed before the nut is eaten; shelled nuts (and unshelled nuts in warm conditions) deteriorate rapidly, becoming rancid within a few weeks or even days in warm humid conditions. Pine nuts are commercially available in shelled form, but due to poor storage, these rarely have a good flavour. All too often they are already rancid at the time of purchase. The most important species in international trade is Korean Pine, harvested in northeast [[China]]. In the [[United States]] and [[Mexico]], the pinyon pines have traditionally been the most highly sought after pine nuts.

Pine nuts are called '''''piñones''''' in [[Spanish language|Spanish]] and '''''pinoli''''' or '''''pignoli''''' (locally also ''pinoccoli'' or ''pinocchi''; [[Pinocchio]] means 'pine nut') in [[Italian language|Italian]]. The pignoli cookie, an Italian speciality confection, is made of almond flour formed in to a dough similar to that of a coconut macaroon and then topped with pine nuts. In the U.S., they are mainly harvested by [[Indigenous people of the Americas|Native American]] tribes; in many areas, they have exclusive rights to the harvest.

In the U.S., bad land use practices have led to the destruction of millions of hectares of productive pinyon pine woods by conversion to [[grazing]] lands, and in China, destructive harvesting techniques (breaking off whole branches to harvest the cones) and cutting of the 
trees for [[timber]] have led to losses in production capacity.

Pine nut coffee is a speciality found in the Southwest United States, especially New Mexico. Piñon, as it is called, is typically a dark roast coffee with a deep, nutty flavor.