Gioconda Filippini Mateo, 52, a former ballet teacher and assistant director of the National Ballet School in Washington and codirector with her husband of the Fairfax City Dance Center, died of cancer Saturday at Arlington Hospital.

Mrs. Mateo was known professionally by her maiden name of Filippini. She and her husband, Raul, founded in 1965 the Fairfax City Dance Center, which teaches ballet and jazz. Before that, Mrs. Mateo was associated with the National Ballet School for two years.

Born in Buenos Aires, Argentina, Mrs. Mateo came here in 1957. She danced, directed and choreographed ballet for the former Civic Ballet Society in Washington. She also created and choreographed several ballets in 1958 that were performed at the Sylvan Theatre and Lisner Auditorium.

Before moving to the United States, Mrs. Mateo was a leading dancer, ballet teacher and choreographer with the Teatro Argentino in South America. In 1960, she returned to her home theater in Buenos Aires for three years to create for it a repertoire of more than 15 ballets.

In addition to her husband, Mrs. Mateo is survived by two daughters, Koren F. and Kim L. both of the home in Falls Church, and hermother, Mecedes Filippini of Buenos Aires.