Uloborus walckenaerius is a spider in the family Uloboridae. Females grow up to 6 mm, males up to 4 mm. It has a dark grey prosoma, covered with white hairs, leaving some dark bands uncovered. The spider lives in warm, open terrain, like heathland, and weaves horizontal cribellate webs close to the ground. A stabilimentum is sometimes present.
Named in honor of Charles Athanase Walckenaer.