Robert Williamson Steele (January 14, 1820 – February 7, 1901) was governor of the extralegal Territory of Jefferson, which existed in the western United States from 1859 to 1861, when it was replaced by the Territory of Colorado.
On September 29, 1859, Steele was nominated for Governor of the proposed Territory of Jefferson. On October 24, 1859 the formation of a provisional government was approved and Steele defeated J.H. St. Matthew for Governor.
Governor Steele opened the first session of the provisional territorial legislature on November 7, 1859, with a proclamation:
Let us then enter upon our duties with a determination of spirit that conquers all difficulties: working for the benefit of the whole commonwealth, encouraging moderation and conservation in all our acts, that we may never be ashamed of having taken an humble part of the organization of a Provisional Government for the Territory of Jefferson.
Steele called for the next session to meet on January 23, 1860.