1509 in science

	… ; 1500; 1501; 1502; 1503; 1504; 1505; ; 1506; 1507; 1508; 1509; 1510; 1511; 1512; ; 1513; 1514; 1515; 1516; 1517; 1518; 1519 …;
	Art; ; Architecture; Literature; Music; ; Science +...;

The year 1509 in science and technology included many events, some of which are listed here.

Exploration[]

September 11 – Diogo Lopes de Sequeira reaches Malacca, having crossed the Gulf of Bengal.

June 11 – Luca Pacioli's De divina proportione, concerning the golden ratio, is published in Venice, with illustrations by Leonardo da Vinci.

Bernardino Telesio, Italian philosopher and natural scientist (died 1588)
possible date – Guillaume Le Testu, French privateer, explorer and cartographer (k. 1573)

^ Ambraseys, N. N. (December 2001). "The Earthquake of 1509 in the Sea of Marmara, Turkey, Revisited" (PDF). Bulletin of the Seismological Society of America. 91 (6): 1397. Bibcode:2001BuSSA..91.1397A. doi:10.1785/0120000305.^{[permanent dead link]}