| Nils Johan Ringdal | |
| Birth Date: | 6 March 1952 |
| Birth Place: | Norway |
| Death Place: | Denpasar, Indonesia |
| Nationality: | Norwegian |
| Occupation: | Author, historian, bodybuilder and judoka |
| Period: | 1970s–2008 |
| Notableworks: | Nationaltheatrets historie 1899-1999 |
| Partner: | Georg Petersen (b. 1947) |
Nils Johan Ringdal (6 March 1952 – 11 September 2008) was a Norwegian author and historian, known mostly for his works on Norwegian occupation history and Norwegian cultural history, and for his controversial book "Nationaltheaterets Historie 1899-1999" (The History of the National Theater 1899-1999). Ringdal had been living in various countries in Southeast Asia since 1988, along with his domestic partner Georg Petersen.[1] Ringdal was found dead on 11 September 2008 in Denpasar, Indonesia.