The name Namtheun has been used to name four tropical cyclones in the northwestern Pacific Ocean. This name was contributed by Laos and named after a river, the Nam Theun.

• Typhoon Namtheun (2004) (T0410, 13W) – struck Japan.
• Tropical Storm Namtheun (2010) (T1008, 09W) – formed between Taiwan and mainland China.
• Typhoon Namtheun (2016) (T1612, 15W, Enteng) – struck Japan.
• Severe Tropical Storm Namtheun (2021) (T2119, 23W) – did not affect land.