Kwee Thiam Tjing Sia, also known by his pen name Tjamboek Bērdoeri ['Thorn Whip'], was a prominent Indonesian writer, journalist and left-wing political activist. He is best remembered for his 1947 book, 'Indonesia dalem Api dan Bara', and for his role as a co-founder of the Partai Tionghoa Indonesia [the 'Chinese-Indonesian Party'] in 1932.

Sia was a hereditary, noble title of Chinese origin, used mostly in colonial Indonesia. It was borne by the descendants of Chinese officers, who were high-ranking, Chinese civil bureaucrats in the Dutch colonial government, bearing the ranks of Majoor, Kapitein or Luitenant der Chinezen.