Chiu Chú-kàn Kong-lō͘ 81 (Eng-bûn: State Trunk Highway 81; WIS 81; STH 81), mā tiāⁿ-tiāⁿ hō-chòe Kong-lō͘ 81 (Highway 81), sī chi̍t tiâu tī Bí-kok Wisconsin Chiu ê chiu-kip kong-lō͘.