The Oregon Railroad and Navigation Company was a railroad company that operated a rail network of 1,143 miles of track running east from Portland, Oregon to northeastern Oregon, northeastern Washington, and northern Idaho.
The railroad operated from 1896 as a consolidation of several smaller railroads. Initially operated as an independent carrier, but Union Pacific acquired the majority stake of the line in 1898. The line became a subsidiary. The Oregon Washington Railroad and Navigation Company in 1910.
In 1936, Union Pacific formally absorbed the system.