The logic and potential derived from the substantive affinity between the two main Iberian languages, Spanish and Portuguese—the only major international languages mutually understandable in general lines—together with profound and numerous elements of a cultural, historical, geopolitical, and cooperative nature, are at the base of the multinational space of Spanish- and Portuguese-speaking countries, which largely corresponds to the sum of the Ibero-American Community of Nations and the Community of Portuguese-Speaking Countries. It is a multinational group that brings together more than 860 million people and 30 countries from all continents, which constitutes the largest linguistic space in the world and represents one-fifth of the planet’s surface, as well as the tenth in demographic terms. In recent years, concrete and verifiable steps have been taken in its articulation process, which will contribute to giving these countries greater visibility and international influence; to promoting horizontal and triangular cooperation between States of America, Europe, Africa, and Asia; and to balancing in geocultural terms—and for the benefit of the greatest cultural and linguistic diversity of the entire international community—some aspects and homogenising worldviews of globalisation in progress. Countries like Mexico in North America, Brazil in South America, Spain in the Iberian Peninsula, and Angola in Southern Africa can play a key role in this process. Of these four states, Brazil is undoubtedly the nation that is structurally in the best position to make a very relevant contribution to the articulation of that multinational space due to its historical, cultural, geographical, and geopolitical position among the group of the Spanish-American countries and the group of Portuguese-speaking African Countries (PALOP) and as a nation located at the same time in the central area of the South Atlantic region. Brazil is also the main Portuguese-speaking country in the world. This work aims to determine whether this structural position is likely to be used by Brazilian diplomacy and foreign policy in order to favour general cooperation between Spanish and Portuguese-speaking countries and to promote a projection of greater influence of Brazil both in the space of Spanish and Portuguese-speaking countries as well as in the international context.