The Sith Order of Decreto had, at its height, many hundreds of alien species affiliated with them.
This incomplete list. The list should only include species wherein a whole planet is under Sith control.
| Species | Year of joining |
|---|---|
| Cerean | 120 ABY |
| Chagrian | |
| Chiss | 56 BBY |
| Devaronian | |
| Epicanthix | 66 ABY |
| Hapan | 66 ABY |
| Humans | At least 4,000 BBY |
| Hutt | |
| Logi | At least 3,940 BBY |
| Lycari | At least 2,000 BBY |
| Mandalorian | 63 ABY |
| Mon Calamari | |
| Nagai | At least 3,964 BBY |
| Nautolan | |
| Rikori | 53 ABY |
| Skrini | At least 2,000 BBY |
| Talortai | At least 250 ABY |
| Twi'lek | |
| Zao tenj | 300 ABY |