Robert Eugene Jenson (May 11, 1931 – January 6, 2018) was a Republican politician from the U.S. state of Oregon. He served in the Oregon House of Representatives representing District 58, which encompassed Union County, Wallowa County, and portions of Umatilla County. District 58 included the cities Pendleton, La Grande, and Enterprise. Jenson served in the Oregon House since 1997 until 2015. At the time of his retirement, as the member with the most seniority, he held the honorary title of Dean of the House.