What is the Spanish name for the quinceañera’s thanksgiving Mass often held before the celebration?

The thanksgiving Mass associated with a quinceañera is called a misa de acción de gracias.

The phrase literally means “Mass of thanksgiving.” In Catholic families, it describes a religious service giving thanks for the girl’s life and asking for blessings as she enters a new stage. The service may take place before the reception, although customs differ widely by country, family, and denomination.

A quinceañera is not itself a sacrament or a required Catholic rite. Some celebrations include a church service, while others are entirely secular. The Mass should therefore not be confused with confirmation, first Communion, or a wedding ceremony.

The reception usually contains the better-known social customs, such as formal attire, symbolic gifts, a court, and special dances. The religious service is one possible part of the celebration, not a universal requirement.