The 5th arrondissement of Paris is one of the twenty administrative divisions of the French capital, situated on the Rive Gauche or Left Bank of the River Seine. As one of the city's central arrondissements, it occupies a significant portion of the historic core of Paris. The area is geographically defined by its position south of the river, covering an area of approximately 2.541 square kilometers within the urban landscape of France.

This district is recognized as the oldest in Paris, with origins dating back to ancient times when it was first built by the Romans. The construction of the Roman town Lutetia began in the 1st century BC following the conquest of a Gaulish site on the île de la Cité. Rue Saint-Jacques served as the main thoroughfare through Lutetia, and traces of this early history survive today in archaeological sites such as the Arènes de Lutèce and the Thermes de Cluny.

The arrondissement is notably home to the Latin Quarter, a district dominated by educational institutions since the creation of the University of Paris in the 12th century. It also contains the eastern part of the National Museum of Natural History and the Jardin des plantes. Key landmarks include the Panthéon, the Institut du Monde Arabe, and the Sainte-Geneviève Library, while the area features numerous religious buildings such as Saint-Étienne-du-Mont church.

The district is defined by its high concentration of educational and research establishments, attracting students and scholars globally. It hosts prestigious institutions including the Collège de France, École Normale Supérieure, and Sorbonne University. The cultural landscape is enriched by museums like the Musée de Cluny and the Musée Curie, as well as the La Grande Mosquée of Paris, which was created in 1922 to honor Muslim tirailleurs who died at Verdun.

In 2023, the population of the arrondissement stood at 55,252 residents. The area has historically been a hub for government and business offices, including the Ministry of Higher Education and Research and Sony Computer Science Laboratories. While the population density peaked in 1911, the district remains a vital center for academia and heritage tourism, offering access to its rich historical sites and academic institutions year-round.