Yunior Díaz Zayas (born 28 April 1987 in Sancti Spíritus) is a Cuban track and field athlete who specialises in the decathlon and long jump.

[2][3] Díaz emerged as one of a talented trio of Cuban male decathletes along with Leonel Suárez and Yordanis García.

[4] He set a decathlon personal best of 8057 in his home town of Havana in March 2008, breaking the 8000-point barrier for the first time.

[5] Díaz's first appearance on the global stage came soon after at 2008 Summer Olympics, but he did not compete in his specialist event but rather as part of Cuba's 4×400 metres relay team with Yunier Pérez, William Collazo and Omar Cisneros.

[6] He won his first senior medal the following year in Havana at the 2009 Central American and Caribbean Championships in Athletics, finishing as runner-up behind compatriot Leonel Suárez but managing to score over 8000 points for the second time in his career with a final total of 8013.