Lista Ong-urilor din Bacau
| Denumire | Județ | Localitate ▲ ▼ |
| Asociatia Simfonia Florilor | Bacau | Bacau |
| Asociatia Siminocul Afj | Bacau | Sanduleni |
| Asociatia Sinbet Afj | Bacau | Onesti |
| Asociatia Sincobac Pas Afj | Bacau | Bacau |
| Asociatia Sindicala Astex Afj | Bacau | Buhusi |
| Asociatia Sindicatul Petrochimistul Afj | Bacau | Onesti |
| Asociatia Sindrom Down Bacau (asdbc) Afj | Bacau | Bacau |
| Asociatia Singur Pe Lume Afj | Bacau | Bacau |
| Asociatia Sipote | Bacau | Orbeni |
| Asociatia Sisters Project | Bacau | Bacau |
| Asociatia Slujind Lui Dumnezeu Slujim Oamenilor Afj | Bacau | Sulta |
| Asociatia Smart Business Afj | Bacau | Orbeni |
| Asociatia Smart Cluster Afj | Bacau | Bacau |
| Asociatia Smart Cluster Afj | Bacau | Bacau |
| Asociatia Smart Kids First | Bacau | Bacau |
| Asociatia Smile Art Foundation Temelia Zambetului | Bacau | Onesti |
| Asociatia Sns Afj | Bacau | Bacau |
| Asociatia Soare Verde | Bacau | Filipesti |
| Asociatia Social Culturala Cleja Afj | Bacau | Cleja |
| Asociatia Sociala Sarata Bacau Afj | Bacau | Sarata |
