Tirso is Spanish and Portuguese for Thyrsus, and usually refers to the saint of that name (Saint Thyrsus) (San Tirso, Santo Tirso). It can also refer to:
People
- Tirso de Molina (1579-1648), Spanish playwright, poet and friar
- Prince Tirso of Bulgaria (2002- )
Places
- Ulà Tirso, commune of Sardinia
- Santo Tirso, city in Portugal
- Santo Tirso parish, municipality in Portugal
- San Tirso de Abres, municipality in Asturias
Geography
- Tirso (river), the most important river of Sardinia
- Ships
- MV Tirso, a tugboat