| Raja Inal Siregar | |
| Order1: | 14th |
| Office1: | Governor of North Sumatra |
| President1: | Soeharto B. J. Habibie |
| Term Start1: | 13 June 1988 |
| Term End1: | 15 June 1998 |
| Predecessor1: | Kaharuddin Nasution |
| Successor1: | Rizal Nurdin |
| Birth Date: | 1938 3, df=y |
| Birth Place: | Medan, Dutch East Indies |
| Death Place: | Medan, Indonesia |
| Nationality: | Indonesian |
| Spouse: | Yuniar Pane |
| Children: | Hotmaria SiregarRiri Rosalina SiregarYuriandi SiregarSiri Yulita Siregar |
Raja Inal Siregar (5 March 1938 – 5 September 2005) was governor of North Sumatra from 1988 to 1998. He was among the Mandala Airlines Flight 091 crash victims, succumbing to his injuries a day after the crash.[1] He was said to be on his way to talks with then-Indonesian President Susilo Bambang Yudhoyono at the time.[2]