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 Cruz III (born 1952), Filipino actor Tirso de Molina (1579-1648), Spanish playwright, poet and friar
Places Ula 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 , a tugboat