Leonardo Pisánský zvaný Fibonacci (okolo 1180? – 1250) (také známý jako Leonardo z Pisy, Leonardo Pisano, Leonardo Bigollo, Leonardo Bonacci) byl středověký italský matematik.
Leonardo Bonacci (c. 1170 – c. 1240–50), [3 ] commonly known as Fibonacci, [b ] [c ] was an Italian mathematician from the Republic of Pisa, considered to be "the most talented Western mathematician of the Middle Ages". [8 ]