Tau could refer to:
- USS Tau (NCC-1871), a Federation starship beginning a lineage
- USS Tau (NCC-1871-A), a Miranda-class starship
- USS Tau (NCC-1871-B), an Excelsior-class starship
- USS Tau (NCC-1871-C), a Nebula-class starship
- USS Tau (NCC-1871-D), a Prometheus-class starship