Martí Joan de Galba (Valencian pronunciation: [maɾˈti dʒuˈan de ˈɣalβa]; died 1490) was once considered to be the co-author of the famous Valencian epic Tirant lo Blanch, which he worked on after the death of his friend, Joanot Martorell. But the nature of his contributions have been called into question, based on differences in the manuscript and the first printed edition by . Joan Roís de Corella has been cited as a more likely source for any substantive additions to the text.