| O. B. Nelson | |
| Office: | Member of the Washington House of Representatives |
| Term: | 1893 - 1895 (3rd district) 1895 - 1897 (4th district) |
| Birth Date: | 25 August 1850 |
| Birth Place: | Denmark |
| Death Place: | Spokane, Washington, United States |
| Party: | Republican |
Ole B. Nelson (August 25, 1850 – June 6, 1922) was a Danish-American politician in the state of Washington. He served in the Washington House of Representatives from 1893 to 1897.[1] [2]