The National Museum of Decorative Arts (Museo Nacional de Arte Decorativo) is an art museum located in the Palermo neighborhood of Buenos Aires, Argentina. The museum is housed in the former mansion of the aristocratic Errázuriz family, which was donated to the Argentine government in the 1930s and opened as a museum in 1937.

The museum's collection focuses on decorative arts, including furniture, textiles, ceramics, silverware, and glassware, from the 17th to the 20th centuries. The museum's galleries display a range of European and Argentine decorative styles, including Rococo, Art Nouveau, and Art Deco.

Some of the museum's most notable works include a collection of French furniture from the 18th century, a set of porcelain vases created by the Sevres factory in the 19th century, and a collection of silver objects created by Argentine silversmiths in the early 20th century.

In addition to its permanent collection, the museum also hosts temporary exhibitions and cultural events throughout the year, including concerts, lectures, and workshops. The museum's gardens, designed by French landscape architect Carlos Thays, are also a popular attraction for visitors, featuring fountains, sculptures, and a variety of plant species.