Altamira was affiliated with numerous cultural and scientific societies internationally. He served as President of the Historical, Philosophical, and Philological Sciences departmentat the Asociación Española para el Progreso de las Ciencias del Ateneo de Madrid [Spanish Association for the Advancement of Sciences at the Athenaeum of Madrid] and was a corresponding member of the Real Academia de la Historia [Royal Academy of History] (1894). He was also associated with the Geographical Society of Lisbon, the Institute of Coimbra, and the Spanish Society of New York and the Massachusetts Historical Society, and became an honorary member of the Royal Society of Literature in London (1908). Additionally, he was an honorary member of the Academia Central Mexicana de Jurisprudencia y Legislación [Central Mexican Academy of Jurisprudence and Legislation] (1910), as well as the Real Academia de Ciencias Morales y Políticas [Royal Academy of Moral and Political Sciences] (1912), the Hispanic Society of America, and the International Institute of Sociology in Paris (1915). His memberships extended to the Academy of Jurisprudence of Toulouse (1916) and the Institute of France (1918). He was president of the Instituto Iberoamericano de Derecho Comparado [Ibero-American Institute of Comparative Law] (1919) and the Círculo de Bellas Artes de Madrid [Circle of Fine Arts in Madrid] (1920). In 1922, he became a full member of the Real Academia de la Historia and later held positions with the Real Academia de Bellas Artes de San Carlos [Royal Academy of Fine Arts of San Carlos] in Valencia (1923), the Real Sociedad Geográfica de Madrid [Royal Geographical Society of Madrid] (1924), and served as honorary president of the Sociedad de Instrucción de San Claudio [Society of Instruction of San Claudio] in Havana (1926). He was recognised as a distinguished member of the Real Centro de Estudios Históricos de Andalucía [Royal Centre for Historical Studies of Andalusia] (1927) and a full member of the International Academy of Comparative Law at The Hague (1928). In 1930, he served as president of the Institut International de Coopération Intellectuelle in Paris, followed by membership with the Sociedad de Geografía e Historia [Society of Geography and History] in Guatemala (1933), and later, he served as president of the Casa de Valencia [House of Valencia] in Madrid (1935). In the same year, he also joined the Czech Academy for Sciences, Literature, and Arts and the Society of Dutch Literature in Leiden as an honorary member. Later roles included honorary director of the Centro de Cultura Valenciano [Valencian Culture Centre], president of the Unión de Profesores Españoles Universitarios en el Extranjero [Union of Spanish University Teachers Abroad], and honorary president of the Casa Regional Valenciana [Valencian Regional House] in Mexico (1948).

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