Luodian County (simplified Chinese: 罗甸县; traditional Chinese: 羅甸縣; pinyin: Luódiàn Xiàn) (Bouyei language: Lachos xianq) is a county under the administration of Qiannan Buyei and Miao Autonomous Prefecture in the south of Guizhou province, China, bordering Guangxi to the south.

The climate in the area is humid subtropical, with strong monsoon influences bringing heavy rain during the summer.

Winters are dry due to the influence of the Siberian high-pressure system.

During the Ming dynasty, Luodian County was affiliated to the Luoboguan Inspection Department of Xilongzhou, Guangxi Province.

In the Qing dynasty, in 1727, Yongfeng Prefecture was set up, and the Luoju Court (now Luodian) was within the territory.