García Sánchez III, sometimes García III, IV, V, or VI (also García of Nájera, from Spanish: García el de Nájera, 1016–1054), was king of Navarre from 1035 to 1054.

He is the eldest legitimate son and heir of Sancho the Great, born November 1016, and he succeeds his father to the crown of Navarre, becoming feudal overlord over two of his brothers: Ramiro, who is given lands that will serve as the basis for the kingdom of Aragón; and Gonzalo, who receives the counties of Sobrarbe and Ribagorza.

Likewise, he has some claim to suzerainty over his brother Ferdinand, who under their father had served as Count of Castile, nominally subject to the Kingdom of León but brought under the personal control of Sancho III.