Notre Dame de Paris is a Gothic, Catholic cathedral on the eastern half of the Île de la Cité in the fourth arrondissement of Paris, France. It is the cathedral of the Catholic Archdiocese of Paris: that is, it is the church that contains the cathedra (official chair), of the Archbishop of Paris, currently André Vingt-Trois. Notre Dame de Paris is widely considered one of the finest examples of French Gothic architecture in France and in Europe. It was restored and saved from destruction by Eugène Viollet-le-Duc, one of France's most famous architects. The name Notre Dame means "Our Lady" in French, and is frequently used in the names of Catholic church buildings in Francophone countries.

Notre Dame de Paris was one of the first Gothic cathedrals, and its construction spanned the Gothic period. Its sculptures and stained glass show the heavy influence of naturalism, unlike that of earlier Romanesque architecture.

Notre Dame de Paris was among the first buildings in the world to use the flying buttress (arched exterior supports). The building was not originally designed to include the flying buttresses around the choir and nave. After the construction began and the thinner walls (popularized in the Gothic style) grew ever higher, stress fractures began to occur as the walls pushed outward. In response, the cathedral's architects built supports around the outside walls, and later additions continued the pattern.

Jean de Jandun recognized the cathedral as one of Paris's three most important buildings in his 1323 "Treatise on the Praises of Paris." He celebrated: "that most terrible church of the most glorious Virgin Mary, mother of God, deservedly shines out, like the sun among stars. And although some speakers, by their own free judgment, because they are able to see only a few things easily, may say that some other is more beautiful, I believe however, respectfully, that, if they attend more diligently to the whole and the parts, they will quickly retract this opinion. Where indeed, I ask, would they find two towers of such magnificence and perfection, so high, so large, so strong, clothed round about with such a multiple variety of ornaments? Where, I ask, would they find such a multipartite arrangement of so many lateral vaults, above and below? Where, I ask, would they find such light-filled amenities as the many surrounding chapels? Furthermore, let them tell me in what church I may see such a large cross, of which one arm separates the choir from the nave. Finally, I would willingly learn where there are two such circles, situated opposite each other in a straight line, which on account of their appearance are given the name of the fourth vowel; among which smaller orbs and circlets, with wondrous artifice, so that some arranged circularly, others angularly, surround windows ruddy with precious colors and beautiful with the most subtle figures of the pictures. In fact I believe that this church offers the carefully discerning such cause for admiration that its inspection can scarcely sate the soul."

The cathedral suffered desecration during the radical phase of the French Revolution in the 1790s, when much of its religious imagery was damaged or destroyed. During the 19th century, an extensive restoration project was completed, returning the cathedral to its previous state. Additionally, the cathedral houses the purported Crown of Thorns in its reliquary.