A Quinceañera in Spanish, or quinceañera in the United States, is a coming of age celebration in Latin American cultures for a girl's 15th birthday as a coming of age. The Spanish names for the celebration can be literally translated to English as the "celebration of the 15-year-old" (fiesta de quinceañera, fiesta de quince años), "15 years" (quince años, quinceañero) or just "15" (quince).

Practices or traditions for the event can vary across different cultures and can take on religious overtones, but typically involve food, dancing, music, and the girl of honor wearing a tiara.

Contemporary festivities combine Catholic traditions from old Spain with the traditions of indigenous heritages of pre-Columbian Mexico, along with a few modern twists, and rely heavily on European influence from the period of the Second Mexican Empire. For example, in ancient Mexico, the Aztecs and other indigenous peoples had many different ceremonies to mark the passage through the various stages of life. The quinceañera marked a young woman's transition to adulthood, as she was presented, as a virgin, to the community for probable suitors.

Other origin stories attribute quinceañera history to the Duchess of Alba in Spain, who hosted a ball at her palace and invited adolescent girls to attend in formal clothes.This tradition continued and was reinforced when Empress Carlota of Mexico, granddaughter of the Louis Philippe I of France, threw a similar reception for her court in Mexico City—presenting young women as eligible for marriage. The traditions of the quinceañera wearing elaborate ball gowns, utilizing courtly European social customs, and ballroom dancing coincides with the styles and customs of the period of the Second Mexican Empire, which was an extension of the European royal courts of the time.

In a traditional Mexican quinceañera, young women and men have roles as formal damas and chambelanes, who perform special bends at the celebration, along with the quinceañera herself. There is also a "man of honor" who accompanies the young woman. Potential suitors present gifts to her family to make up a dowry or bridal wealth. Prior to her being given away, the women of the community participate by instructing the quinceañera in her duties and responsibilities, urging her to follow the correct path, by remaining true to her people and their traditions throughout her life.

The meaning behind the quinceañera has become more refined over time and has been adapted by various Latino cultures in relation to where they are living.

In rural societies, girls were considered ready for marriage once they turned 15. In the 20th century, the quinceañera received certain privileges associated with womanhood: permission to attend adult parties, pluck her eyebrows and shave her legs, wear makeup, jewelry and high heels. When this tradition originated, the quinceañera was a small party to celebrate the transition. Friends and family gathered in order to give the girl a chance to mingle with young men. Rich families celebrated quinceañeras with big parties and elaborate dresses. In Latin American countries, wealthy families announced quinceañeras in the newspapers to publicize their extravagant celebrations.^{[citation needed]}

In the 1960s, as more Latinos migrated to the United States, they brought their differing national traditions with them. Once in the United States, formerly poor immigrants with good jobs were able to have big parties such as those back in their home country. Family and friends often help put on the event, for example, by making food.