(38984) 2000 UZ4, provisional designation 2000 UZ4, is carbonaceous Zhongguo asteroid from the outermost regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 24 October 2000, by astronomers with Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. The likely elongated C-type asteroid has a rotation period of 19.20 hours.