| Honorific Prefix: | Drs. |
| Gustav Sinaga | |
| Office: | Regent of North Tapanuli |
| Governor: | Kaharuddin Nasution Raja Inal Siregar |
| Term Start: | 16 February 1984 |
| Term End: | 16 February 1989 |
| Predecessor: | Salmon Sagala |
| Successor: | Lundu Panjaitan |
| Birth Date: | 23 September 1939 |
| Birth Place: | Tanah Jawa, Simalungun, Dutch East Indies |
| Death Place: | Medan, North Sumatra, Indonesia |
| Children: | Justina Mariana Henrad Ronald Honer Bochem Hestina Sinaga |
Drs. Gustav Sinaga (23 September 1939 – 29 October 1991) was a Simalungun politician and bureaucrat person who served as the Regent of North Tapanuli from 1984 until 1989.
Sinaga was born on 23 September 1939 at Tanah Jawa, Simalungun. He went to study at the Tanah Jawa elementary school in 1945, and continued to study at the Junior High School and High School in Pematangsiantar. He continued to study at the Gajah Mada University, and graduated in 1960.[1]
Sinaga began his career as an employee for financial and administration affairs in the office of the Governor of North Sumatra. In 1967, he became the Junior Superintendent in the Financial Bureau, and he became Superintendent in the Financial Bureau four years later. On 1 April 1977, he was appointed as the head of the Bureau, and in 1982, he became an assistant to the Regional Secretary of North Sumatra.[1]
Sinaga was inaugurated as the Regent of North Tapanuli on 16 February 1984. He replaced the previous regent, Salmon Sagala.[1]
During his term, Sinaga began to attract investment into North Tapanuli. Since June 1988, various national companies such as pulp factories, tea plantations, kaolinite mine, and mica mine, began to operate in North Tapanuli.[1]
After his term as the Regent of North Sumatra had expired, he was reappointed to his previous position, the Assistant to the Regional Secretariat of North Sumatra. He died on 29 October 1991 after attending the inauguration for the new office of the Government Tourism Bureau in Pancing Street, Medan.[1]
He was married to Astillia Pardede on 23 September 1963. The marriage resulted in two sons and two daughters.[1]