| Age | 53 (age at death) |
| Birthday | 7 March, 1856 |
| Died | 23 January, 1910 |
| Zodiac Sign | Pisces |
| Nationality | Finnish |
| Occupation | Politician |
Oskar Adolf Hainari (7 March 1856 – 23 January 1910; surname until 1906 Forsström) was a Finnish secondary school teacher, journalist and politician, born in Tohmajärvi. He was a Member of the Diet of Finland in 1899, in 1900 and from 1904 to 1905 and a Member of the Parliament of Finland from 1908 until his death in 1910, representing the Finnish Party.
