Sirena
- Launched: 2000
- Passengers: 684
- Class: R
Oceania Sirena is an R-class ship, carrying approximately 684 guests. She sails destination-rich itineraries across the Mediterranean, Caribbean, and South America, offering the complete Oceania experience in an intimate boutique format. All specialty dining — Red Ginger, Polo Grill, Toscana, Jacques — is included in the base fare, and extended port stays allow genuine immersion rather than rushed highlights. Sirena was refurbished in 2016 to Oceania's current standards.