The Lely Mountains (Dutch: Lelygebergte, Ndyuka: Ando Busiman Mongo) are a mountain plateau on the left bank of the Tapanahony and Marowijne rivers in Suriname. The plateau has a maximum altitude of about . In 2005, 25 new species were discovered in the Lely Mountains.
The mountain range is served by the Lelygebergte Airstrip.
The mountain range is named after Cornelis Lely, a former governor of Suriname. The Ndyuka maroons call the mountains the Ando Busiman Mongo after the famed Ndyuka explorer Ando Busiman.