The Walls of Dom Fernando, or Fernandine Walls, are medieval fortifications located in the civil parish of Cedofeita, Santo Ildefonso, Sé, Miragaia, São Nicolau e Vitória, in the municipality of Porto, Portuguese Porto.

The Fernandine Walls of Porto are a series of medieval fortifications that were commissioned in 1336 by King D. Afonso IV and constructed with a Romanesque wall. These impressive walls encircle the city, some sections reaching towards the riverfront and extend over 200 years, protecting it from foreign invasion. One notable element is the Postigo do Carvão dating to 1348, which remains intact until today. Fast-forward several centuries later and the Fernandina Walls have been restored many times since, most notably during the Estado Novo era. Nowadays, these fascinating defensive structures form a striking backdrop to the city, and visitors can explore its towers, gates, courtyards, stairways and old fortresses for themselves.