| Siku | |
| Elevation M: | 4740 |
| Location: | Bolivia, Potosí Department |
| Range: | Andes |
| Map: | Bolivia |
| Label Position: | right |
| Map Size: | 200 |
| Coordinates: | -19.9558°N -66.0025°W |
Siku (also spelled Siqu) (Aymara siku or siqu a kind of flute, also spelled Sekho, Seko) or Siq'u (Quechua for slidable rope; perforated) are the names of a mountain in the Bolivian Andes which reaches a height of approximately 4740m (15,550feet). It is located in the Potosí Department, Antonio Quijarro Province, Tomave Municipality.