Longdong may refer to:
- Longdong Stream Salamander, species native to Sichuan
The following entries are written as "龙洞" unless otherwise noted:
- Longdong, Hunan, town in Xiangxiang
- Longdong Township, Chongqing, in Yunyang County
- Longdong Township, Sichuan, in Cangxi County
- Longdong Subdistrict, Guangzhou, in Tianhe District
- Longdong Subdistrict, Tangshan (龙东街道), in Lubei District, Tangshan, Hebei
- Longdong Subdistrict, Jiaozuo, in Zhongzhan District, Jiaozuo, Henan
- Longdong Subdistrict, Jinan, in Lixia District, Jinan, Shandong
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