Hadrianus Sinaga (15 June 1912 – 11 July 1981) was the eighth minister of health of Indonesia.

[1] Hadrianus Sinaga was born in Hatoguan, Samosir Island, Dutch East Indies, on 15 June 1912.

He went to the Dutch East Indies Doctors' School in Surabaya, and finished his studies in 1942.

[2] Sinaga was chosen as the 3rd general secretary of the Indonesian Christian Party at its 3rd congress from 7–9 April 1950 in Jakarta.

During his tenure he initiated the building of a regional hospital in Samosir, with the funds from UNICEF.