La Paz (officially known as Nuestra Señora de La Paz, English: "Our Lady of Peace"), also named Chuqi Yapu (Chuquiago) in Aymara, is the seat of government of the Plurinational State of Bolivia. With an estimated 816,044 residents as of 2020, La Paz is the third-most populous city in Bolivia.

La Paz, which lies between 3,250 and 4,100 meters above sea level, is the world’s highest national capital. Visitors, upon arrival, often find exertion difficult because of the rarefied atmosphere at those elevations. The center of the city lies in a deep, broad canyon formed by the La Paz, or Choqueyapu, River. The city’s location, about 430 meters below the surface of the Altiplano, the high intermontane plateau, affords some protection from the cold winds of the highlands. Population growth since the latter part of the 20th century has expanded the city up the canyon walls to the edge of the Altiplano. La Paz was Bolivia’s most populous city until the turn of the 21st century when it was overtaken by Santa Cruz.

Founded in 1548 as Nuestra Señora de La Paz (“Our Lady of Peace”) by the conquistador Captain Alonso de Mendoza on the site of an Inca village, the city was renamed La Paz de Ayacucho in 1825, in commemoration of the last decisive battle in the wars of independence. The seat of the national government was established there in 1898, but Sucre remains Bolivia’s constitutional capital, home to the country’s Supreme Court; La Paz is the seat of the executive and legislative branches.

La Paz is also an important cultural center of Latin America, as it hosts several landmarks belonging to the colonial times, such as the San Francisco Church, the Metropolitan Cathedral, the Plaza Murillo, and Jaén Street. The city is renowned for its unique markets, particularly the Witches' Market, and its vibrant nightlife. Its unusual topography offers unique views of the city and the surrounding mountains of the Cordillera Real from numerous natural viewing points. La Paz is also home to the largest urban cable car network in the world. In May 2015, it was officially recognized as one of the New 7 Wonders Cities.