The bunga mas dan perak (lit. "golden and silver flowers"), often abbreviated to bunga mas (Jawi: بوڠا مس "golden flowers"), was a tribute sent every three years to the king of Siam from its vassal states in the Malay Peninsula, in particular, Terengganu, Kelantan, Kedah, Pattani, Nong Chik, Yala and Rangae. The tribute consisted of two small trees made of gold and silver, plus costly gifts of weapons, goods and slaves. 
There are several supposed origins of and reasons for the establishment of the tradition:
- 17th-century Kedah rulers considered it to be a token of friendship.
- Thai kings maintained it was a recognition of their suzerainty.
The practice ended with Anglo-Siamese Treaty of 1909, which Siamese ruling in four states were ceded to Great Britain.