The Cathedral Church of Saint Peter and Saint Paul, popularly known as Washington National Cathedral, is a cathedral of the Episcopal Church located in Washington, D.C., the capital of the United States. Of neogothic design, it is the sixth-largest cathedral in the world, the second-largest in the United States, and the fourth-tallest structure in Washington, D.C. The cathedral is the seat of both the Presiding Bishop of the Episcopal Church, Katharine Jefferts Schori, and the Bishop of the Diocese of Washington, Mariann Edgar Budde. In 2009, nearly 400,000 visitors toured the structure. The congregation numbers 800.

The Protestant Episcopal Cathedral Foundation, under the first seven Bishops of Washington, erected the cathedral under a charter passed by the United States Congress on January 6, 1893. Construction began on September 29, 1907, when the foundation stone was laid in the presence of President Theodore Roosevelt and a crowd of more than 20,000, and ended 83 years later when the last finial was placed in the presence of President George H. W. Bush in 1990. Decorative work, such as carvings and statuary, is ongoing as of 2011. The foundation operates and funds the cathedral. In 2011, the cathedral was the recipient of $700,000 in federal funds as part of the Save America's Treasures program.