Vivion de Valera (13 December 1910 – 16 February 1982) was an Irish scientist, businessman, lawyer and politician. He was the eldest child of the former Taoiseach and President, Éamon de Valera and Sinéad de Valera and was named after his paternal grandfather, Juan Vivion de Valera. He is also the uncle of former ministers Síle de Valera and Éamon Ó Cuív.
Born in Dublin in 1910, Vivion de Valera was educated at Blackrock College, University College Dublin (MSc, PhD) and King's Inns. While at UCD, he was auditor of the Literary and Historical Society. He was called to the Bar in 1937. After military service during "The Emergency", de Valera retired from the army with the rank of Major. In 1945, he embarked on a political career, being elected as a Fianna Fáil TD for Dublin North–West. He served in Dáil Éireann until 1981. He was a director of the Irish Press Ltd from 1932 until 1982 and managing director from 1951 until 1982.
Vivion de Valera died in Dublin in 1982.