| Tree Army, Wyoming | Encyclopedia | Kerry Drake |
| Tunison Lawsuit and Settlement | Encyclopedia | WyoHistory.org |
| U.S. Airmail in Wyoming | Encyclopedia | Steve Wolff |
| U.S. Bureau of Reclamation in Wyoming | Encyclopedia | Phil Roberts |
| U.S. Marines invade Teapot Dome | Encyclopedia | Carolynne Harris |
| Uinta County Courthouse | Field Trips | |
| Uinta County Museum | Field Trips | |
| Uinta County, Wyoming | Encyclopedia | Barbara Allen Bogart |
| Union Pacific Depot, Cheyenne | Field Trips | |
| Union Pacific Depots | Field Trips | |
| Union Pacific Ice Ponds | Field Trips | |
| Union Pacific in Wyoming, The | Encyclopedia | Gregory Nickerson |
| Union Pacific Roundhouse and Railyards Complex | Field Trips | |
| United Air Lines stewardess school, Cheyenne | Encyclopedia | Michael Kassel, Starley Talbott |
| United Airlines Flight 409, 1955 crash of | Encyclopedia | Thaddeus Mast |
| University of Wyoming Agricultural Experiment Station | Field Trips | |
| University of Wyoming Anthropology Department Museum | Field Trips | |
| University of Wyoming Athletics Hall of Fame | Field Trips | |
| University of Wyoming Geological Museum | Field Trips | |
| University of Wyoming Textbook Controversy | Encyclopedia | Phil Roberts |
| Unthank, Alvah grave, Oregon Trail site of | Encyclopedia | Randy Brown |
| Upton Chamber of Commerce | Field Trips | |
| Upton Old Town | Field Trips | |
| Upton, Wyoming | Encyclopedia | Nicole Lebsack |
| Uranium business, history of in Wyoming | Encyclopedia | Chamois L. Andersen, Lori Van Pelt |
| Utah War, 1857-1858 | Encyclopedia | Rebecca Hein |
| Utes, 1906 flight of through Wyoming | Encyclopedia | Tom Rea |
| Van Buskirk, Harold, on Running a Bighorn Basin Grocery Store | Oral Histories | Washakie Museum and Cultural Center |
| Van Devanter, Willis, Wyoming U.S. Supreme Court justice | Encyclopedia | Lori Van Pelt |
| Veteran's Park, Casper | Field Trips | |
| Vietnam: Army pilot Bill Graves swaps audio tapes with his family in 1967 | Oral Histories | Wyoming State Archives |
| Virginian Hotel | Field Trips | |
| Visual artists, Italian POWs in Douglas | Encyclopedia | Laura E. Ruberto |
| Vore Buffalo Jump | Field Trips | |
| Vore Buffalo Jump | Encyclopedia | WyomingHeritage.org |
| Votes for Wyoming Women | Encyclopedia | Tom Rea |
| W Hill | Field Trips | |
| W Hill, Laramie, origins of | Encyclopedia | Phil Roberts |
| Wagon Box Fight | Encyclopedia | Kerry Drake |
| Wagon Wheel Project | Encyclopedia | Ann Chambers Noble |
| Wagon Wheel Project test site | Field Trips | |
| Walker, Glenna, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Walker, Kevin, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Wanamaker, Joseph | Encyclopedia | Johanna Wickman |
| War horses, Wyoming as breeding ground for, 1897-1949 | Encyclopedia | Rebecca Hein |
| Warden, George Francis (Big Nose George) | Encyclopedia | Lori Van Pelt |
| Warm Springs, Oregon Trail site of | Encyclopedia | WyoHistory.org |
| Warren Air Force Base and its Nuclear Weapons in the Cold War | Encyclopedia | Dan Whipple |
| Warren, Francis | Encyclopedia | Wyoming State Archives |
| Warren, Francis E., biographical essay | Encyclopedia | Kerry Drake |
