Chetco may refer to: Chetco people, a group of Native Americans who lived in southwestern Oregon in the United States Chetco language (ISO 639-3: ctc), also known as the Tolowa language (ISO 639-3: tol) Chetco River, a river named for the tribe, flowing to the Pacific Ocean in Curry County, Oregon in the United States Chetco Peak, a mountain near the source of the Chetco River in Oregon in the United States - original name of USS Penguin (ASR-12) Chetco effect - also known as the Brookings effect, a weather pattern off the mouth of the Chetco River at the city of Brookings on the Oregon coast