This page lists historical and other events on May 3rd in Catalonia and the Catalan-speaking countries as well as festivals and a list of births and deaths of well-known Catalans.
1462 - Salvatierra, Kingdom of Navarre: Joan the Great and Louis XI of France meet to begin negotiations for what would become the Treaty of Baiona.
1812 - Mataró: During the Peninsula War (La Guerra del Francès), the troops of General Luís de Lacy try to take the town with the help of the British fleet but are beaten back by the French.
1871 - Barcelona: The Ajuntament of Barcelona is the first in Spain to introduce the decimal metric system in commerce.
1930 - Barcelona: The founding of the Federació Catalana de Patinatge.
1937 - Barcelona: The Events of May (Els Fets de Maig), an anarchist revolt is put down by the government.
1939 - València: A military parade, known as El Desfile de la Victoria, presided by Franco to commemorate the conquest of the city.
1854 - Palma, Mallorca: Joan Alcover, Mallorcan poet (died 1926).
1894 - Barcelona, Barcelonès: Miquel Llor i Forcada, Catalan writer (died 1966)
1914 - Barcelona, Barcelonès: Martí de Riquer i Morera, humanist, specialist in medieval and troubadour literature and expert in the Spanish Golden Age and Don Quixote (died 2013).
1950 - Utiel, Plana d'Utiel: Gabriel Albiac, Valencian philosopher and writer.
1975 - Xàtiva, la Costera: Ximo Cerdà, Valencian professor, scientist, writer and illustrator.
The Festes dedicated to La Diada de la Santa Creu are celebrated on May 3rd in various towns around Catalonia, most notably Figueres, are also known as Les Creus de Maig.