Misión San Francisco Borja de Adac was a Spanish mission established in 1762[1] by the Jesuit Wenceslaus Linck at the Cochimí settlement of Adac, west of Bahía de los Ángeles.

The mission was named after Francis Borgia, 4th Duke of Gandía.

Before becoming a mission, the future site of San Borja served as a visita or subordinate mission station for Misión Santa Gertrudis.

A stone church was completed during the Dominican period, in 1801.

The mission was abandoned in 1818, as the native population in this part of the peninsula disappeared.