- Sigma (CHL) (Thrash Metal-Chile)
- Sigma (COL) (Progressive Metal-Colombia)
- Sigma (CAN) (Melodic Death-Canada)
- Sigma (ITA) (Power Metal-Italy)
- Sigma 5 (Progressive Metal-Brazil)
- Sigma Draconis (Pagan Black-Italy)
- Sigma Epsilon (Thrash Metal-Serbia)
- Sigma Project (Progressive Metal-Brazil)
- Sigma Sentinel (Melodic Power-Uruguay)
- Sigma (URY) (Melodic Power-Uruguay)