Siak Sri Indrapura Palace or Siak Palace is an istana (royal palace) of the Sultanate of Siak Sri Indrapura that is located at Siak Regency, Riau, on the island of Sumatra, Indonesia. The palace is now transformed into a museum.
The palace complex has an area of about 32,000 square meters consisting of 4 palaces namely Istana Siak, Istana Lima, Istana Padjang, and Istana Baru. Each of the palace including Siak Palace itself has an area of 1,000 square meters.
The Moorish-style palace, which is now a museum located 120 kilometres (75 mi) upstream of the Siak river in Pekanbaru was built by the 11th sultan, Syarif Hasyim Abdul Jalil Syarifuddin of Sultanate of Siak Sri Indrapura in 1889. The architecture of the palace has European influences that blend harmoniously with the Malay and Moorish elements. Before constructing the palace the Sultan traveled Netherlands and Germany, even some of the furniture was brought from Europe.
There is a myth related with the foundation. It is said that while the Sultan and his dignitaries were discussing the project, suddenly appeared a white dragon on the surface of the river Siak. The presence of the dragon was interpreted as a sign of blessing of the project and auspicious for the greatness of the kingdom. To immortalize the dragon, the Sultan made it the official emblem of the kingdom. The pillars of the palace were decorated with ornaments in the form of dragons.