Eulogio Aranguren Labairu (27 July 1892 – 19 October 1972[1]) was an Argentine footballer who spent his youth in Basque Country.
In this period he made 20 appearances but failed to score in official games, as he played mostly as defender.
Three years after the premature death of his brother, Eulogio (together with King Alfonso XIII and a sister of Machimbarrena, the captain of Real Madrid who also died in the same period) inaugurated a statue to the two players at the entrance of the first team's locker room.
He had 5 children, Jose Eulogio (Josechu), Maruchi, Fernando, Sotero (died in infancy) and Ignacio.
Together with his brother, the Arangurens were the inaugural Argentine born footballers to play for Real Madrid.