Mateus Fernandes (died 10 April 1515), also called Mateus Fernandes the Elder, was a Portuguese architect. He was noted for his works in the Manueline style at the Monastery of Batalha, Portugal.
He became master of works at the monastery of Batalha in 1490 or slightly earlier, during the reign of king John II of Portugal. Before this date, nothing is known of his private life, as he has left no records to consult other than his architectural marvels. He succeeded the architect Fernão de Évora as architect of the monastery. Mateus Fernandes later became the primary architect of the next king, Manuel I of Portugal, who made him the supervisor of other architectural works in the rest of the country.
However, Mateus Fernandes is best known for his work in "Manueline style" at the entrance portal of the roofless, Unfinished Chapels (Capelas Imperfeitas) of the Monastery of Batalha. The exceptionally large portal rises to a monumental fifteen m by 7½ m wide (50 x 25 ft), overshadowing the rest of the chapels at the monastery. It was originally built in Late Gothic style, but was transformed beyond recognition by Fernandes into one of the first masterpieces of Manueline style (completed in 1509). The Manueline style would then spread from Batalha throughout all Portugal.
The portal is completely decorated into a lacework of sumptuous Manueline motifs, with flamboyant iconography including the armillary symbol of the cosmos, the cross of the Order of Christ (that decorated the sails of the Portuguese ships of the discoverers), spheres, winged angels, ropes, circles, tree stumps, trefoil arches and florid projections. Fernandes was again original by making the sculptural aspect dominate over the architectural aspect, united in an asymmetrical composition. Mateus Fernandes has tried to represent in stone, the exuberant and expansive spirit in the reign of king Manuel.