Lanling County (simplified Chinese: 兰陵县; traditional Chinese: 蘭陵縣; pinyin: Lánlíng Xiàn) formerly Cangshan County (simplified Chinese: 苍山县; traditional Chinese: 蒼山縣; pinyin: Cāngshān Xiàn) is a county of southern Shandong, bordering Jiangsu province to the south. It is under the administration of Linyi City.
The population was 1,137,651 in 1999.