Père Lachaise Cemetery (French: Cimetière du Père-Lachaise, [simtjɛːʁ dy pɛːʁ laʃɛːz]; officially, cimetière de l'Est, "East Cemetery") is the largest cemetery in the city of Paris, France (44 hectares (110 acres)), though there are larger cemeteries in the city's suburbs.

Père Lachaise is in the 20th arrondissement, and is reputed to be the world's most visited cemetery, attracting hundreds of thousands of visitors annually to the graves of those who have enhanced French life over the past 200 years. It is also the site of three World War I memorials.

The cemetery is on Boulevard de Ménilmontant. The Paris Métro station Philippe Auguste on line 2 is next to the main entrance, while the station called Père Lachaise, on both lines 2 and 3, is 500 metres away near a side entrance. Many tourists prefer the Gambetta station on line 3, as it allows them to enter near the tomb of Oscar Wilde and then walk downhill to visit the rest of the cemetery.

The cemetery takes its name from the confessor to Louis XIV, Père François de la Chaise (1624–1709), who lived in the Jesuit house rebuilt in 1682 on the site of the chapel. The property, situated on the hillside from which the king during the Fronde, watched skirmishing between the Condé and Turenne, was bought by the city in 1804. Established by Napoleon in this year, the cemetery was laid out by Alexandre-Théodore Brongniart, and later extended.