The Arc de Triomphe de l'Étoile (UK: /ˌɑːrk də ˈtriːɒmf, - ˈtriːoʊmf/, US: /- triːˈoʊmf/, French: [aʁk də tʁijɔ̃f də letwal] lit. 'Triumphal Arch of the Star') is one of the most famous monuments in Paris, France, standing at the western end of the Champs-Élysées at the centre of Place Charles de Gaulle, formerly named Place de l'Étoile—the étoile or "star" of the juncture formed by its twelve radiating avenues. The location of the arc and the plaza is shared between three arrondissements, 16th (south and west), 17th (north), and 8th (east). The Arc de Triomphe honours those who fought and died for France in the French Revolutionary and Napoleonic Wars, with the names of all French victories and generals inscribed on its inner and outer surfaces. Beneath its vault lies the Tomb of the Unknown Soldier from World War I.

The central cohesive element of the Axe historique (historic axis, a sequence of monuments and grand thoroughfares on a route running from the courtyard of the Louvre to the Grande Arche de la Défense), the Arc de Triomphe was designed by Jean Chalgrin in 1806; its iconographic programme pits heroically nude French youths against bearded Germanic warriors in chain mail. It set the tone for public monuments with triumphant patriotic messages. Inspired by the Arch of Titus in Rome, Italy, the Arc de Triomphe has an overall height of 50 metres (164 ft), width of 45 m (148 ft) and depth of 22 m (72 ft), while its large vault is 29.19 m (95.8 ft) high and 14.62 m (48.0 ft) wide. The smaller transverse vaults are 18.68 m (61.3 ft) high and 8.44 m (27.7 ft) wide. Three weeks after the Paris victory parade in 1919 (marking the end of hostilities in World War I), Charles Godefroy flew his Nieuport biplane under the arch's primary vault, with the event captured on newsreel.

Paris's Arc de Triomphe was the tallest triumphal arch until the completion of the Monumento a la Revolución in Mexico City in 1938, which is 67 metres (220 ft) high. The Arch of Triumph in Pyongyang, completed in 1982, is modelled on the Arc de Triomphe and is slightly taller at 60 m (197 ft). La Grande Arche in La Défense near Paris is 110 metres high. Although it is not named an Arc de Triomphe, it has been designed on the same model and in the perspective of the Arc de Triomphe. It qualifies as the world's tallest arch.

The astylar design is by Jean Chalgrin (1739–1811), in the Neoclassical version of ancient Roman architecture. Major academic sculptors of France are represented in the sculpture of the Arc de Triomphe: Jean-Pierre Cortot; François Rude; Antoine Étex; James Pradier and Philippe Joseph Henri Lemaire. The main sculptures are not integral friezes but are treated as independent trophies applied to the vast ashlar masonry masses, not unlike the gilt-bronze appliqués on Empire furniture. The four sculptural groups at the base of the Arc are The Triumph of 1810 (Cortot), Resistance and Peace (both by Antoine Étex) and the most renowned of them all, Departure of the Volunteers of 1792 commonly called La Marseillaise (François Rude). The face of the allegorical representation of France calling forth her people on this last was used as the belt buckle for the honorary rank of Marshal of France. Since the fall of Napoleon (1815), the sculpture representing Peace is interpreted as commemorating the Peace of 1815.

In the attic above the richly sculptured frieze of soldiers are 30 shields engraved with the names of major French victories in the French Revolution and Napoleonic wars. The inside walls of the monument list the names of 660 people, among which are 558 French generals of the First French Empire; The names of those generals killed in battle are underlined. Also inscribed, on the shorter sides of the four supporting columns, are the names of the major French victories in the Napoleonic Wars. The battles that took place in the period between the departure of Napoleon from Elba to his final defeat at Waterloo are not included.

For four years from 1882 to 1886, a monumental sculpture by Alexandre Falguière topped the arch. Titled Le triomphe de la Révolution ("The Triumph of the Revolution"), it depicted a chariot drawn by horses preparing "to crush Anarchy and Despotism". It remained there only four years before falling in ruins.

Inside the monument a permanent exhibition, conceived by artist Maurice Benayoun and architect Christophe Girault, opened in February 2007.[23] The steel and new media installation interrogates the symbolism of the national monument, questioning the balance of its symbolic message during the last two centuries, oscillating between war and peace.

Beneath the Arc is the Tomb of the Unknown Soldier from World War I. Interred on Armistice Day 1920, it has the first eternal flame lit in Western and Eastern Europe since the Vestal Virgins' fire was extinguished in the fourth century. It burns in memory of the dead who were never identified (now in both world wars).

A ceremony is held at the Tomb of the Unknown Soldier every 11 November on the anniversary of the Armistice of 11 November 1918 signed by the Entente Powers and Germany in 1918. It was originally decided on 12 November 1919 to bury the unknown soldier's remains in the Panthéon, but a public letter-writing campaign led to the decision to bury him beneath the Arc de Triomphe. The coffin was put in the chapel on the first floor of the Arc on 10 November 1920, and put in its final resting place on 28 January 1921. The slab on top bears the inscription ICI REPOSE UN SOLDAT FRANÇAIS MORT POUR LA PATRIE 1914–1918 ("Here lies a French soldier who died for the fatherland 1914–1918").

In 1961, U.S. President John F. Kennedy and First Lady Jacqueline Kennedy paid their respects at the Tomb of the Unknown Soldier, accompanied by President Charles de Gaulle. After the 1963 assassination of President Kennedy, Mrs Kennedy remembered the eternal flame at the Arc de Triomphe and requested that an eternal flame be placed next to her husband's grave at Arlington National Cemetery in Virginia. President Charles de Gaulle went to Washington to attend the state funeral, and witnessed Jacqueline Kennedy lighting the eternal flame that had been inspired by her visit to France.