Peleș Castle is a Neo-Renaissance castle in the Carpathian Mountains, near Sinaia, in Prahova County, Romania, on an existing medieval route linking Transylvania and Wallachia, built between 1873 and 1914. Its inauguration was held in 1883. It was constructed for King Carol I.

When King Carol I of Romania (1839–1914), under whose reign the country gained its independence, first visited the site of the future castle in 1866, he fell in love with the magnificent mountain scenery. In 1872, the Crown purchased 5 square kilometres (1.9 sq mi) of land near the Piatra Arsă River. The estate was named the Royal Estate of Sinaia. The King commissioned the construction of a royal hunting preserve and summer retreat on the property, and the foundation was laid for Peleș Castle on 22 August 1873.

The cost of the work on the castle undertaken between 1875 and 1914 was estimated to be 16,000,000 Romanian lei in gold (approx. US$ 120 million today). Between three and four hundred men worked on the construction.

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