Pecos may refer to: Places Pecos River, rises near Santa Fe, New Mexico, United States Pecos, Texas, a city in Reeves County, Texas, United States Pecos County, Texas, named for the Pecos River Pecos Spring, a spring Pecos, New Mexico, a village, United States Pecos National Historical Park, a National Historical Park in the U.S. state of New Mexico Trans-Pecos, a region of Texas, United States Ships USS Pecos, the name of two ships of the United States Navy USNS Pecos (T-AO-197), a U.S. Navy fleet replenishment oiler in service since 1989 Other uses Pecos Bill, a mythical American cowboy Pecos Classification, a division of all known Ancient Pueblo Peoples culture into chronological phases Pecos League, an independent professional baseball league headquartered in Houston Oryx/Pecos, a proprietary operating system developed by Bell Labs beginning in 1978, consisting of a kernel (Oryx) and the associated processes running on top of it (Pecos) Pecos Smith Character in: The Gun Packer, 1919 silent western hero of the Zane Grey novel West of the Pecos and its film adaptations: West of the Pecos, 1934 film West of the Pecos, 1945 film The Chinese Paymaster, 1967 novel See also Pecos Bill (disambiguation) Peco (disambiguation)