The National Museum Cardiff, in the homonymous city and capital of Wales, is a museum and art gallery.

The National Museum Cardiff was founded in 1907, the year in which the collection of the Cardiff Museum was definitively included, which previously shared the headquarters with the Cardiff Central Library. The original design was designed by Arnold Dunbar Smith and Cecil Brewer. It opened to the public in 1927. Today the museum has collections covering various areas: botany, archeology, figurative and applied art, zoology and geology.

The art collection is considered one of the most sought after and refined in all of Wales with a large section of twentieth century art, with particular attention to Impressionist art.

Also interesting is the geology section of the museum where the history of Wales is traced through exhibits of fossils, rocks and minerals. There are also dinosaur skeletons and reconstructions. The museum also regularly hosts temporary exhibitions of various kinds.