What is the name of the formal Catholic service sometimes held for a quinceañera?

The formal Catholic service sometimes held for a quinceañera is called a Misa de acción de gracias.

The phrase translates as “Mass of thanksgiving.” During this service, the celebrant may give thanks for life, family, and the transition represented by the fifteenth birthday. The service can take place before the reception and may include prayers, Scripture readings, a blessing, and participation by parents or sponsors.

This Mass is not required for every quinceañera. Some celebrations are entirely secular, while others include a church blessing rather than a full Mass. Local dioceses and parishes may also set their own requirements, such as preparation sessions or proof of baptism.

Misa de gallo means Midnight Mass, especially at Christmas, so it is a different Catholic observance. The exact wording and structure of a quinceañera service can vary by country and parish.