The Oregon Constitution is the governing document of the U.S. state of Oregon, originally enacted in 1857. As amended the current state constitution contains eighteen sections, beginning with a bill of rights. This contains most of the rights and privileges protected by the United States Bill of Rights and the main text of the United States Constitution. The remainder of the Oregon Constitution outlines the divisions of power within the state government, lists the times of elections, and defines the state boundaries and the capital as Salem.

The Oregon Constitutional Convention in 1857 drafted the Oregon Constitution in preparation for the Oregon Territory to become a U.S. state. Held from mid-August through September, 60 men met in Salem, Oregon, and created the foundation for Oregon's law. The proposal passed with a vote of 35 for adoption to 10 against. Oregon then became the 33rd state of the Union on February 14, 1859.