Opegoi (also, Op-pe-o, Oppe-yoh, Oppegach, Oppegoeh, Redcaps, Up-pa-goine, Up-pa-goines, and Up-pah-goines) is a former Karok settlement in Humboldt County, California. It was located on the Klamath River opposite the mouth of Red Cap Creek, at an elevation of 341 feet (104 m).