Sotero Aranguren Labairu (7 May 1894 – 26 February 1922), was an Argentine footballer born in Buenos Aires who spent his youth in Basque Country.

He played for Real Madrid for seven years, between 1911 and 1918, scoring 4 goals in 60 matches.

[1] His premature death at the age of 28 led the club to build a statue representing Sotero and one of his team-mates, Machimbarrena (who also died young) at the entrance of the first team's locker room.

[citation needed] The statue, added in 1925, now stands at the Santiago Bernabéu Stadium, and is seen as a totem of inspiration for Real Madrid's coming generations of footballers.

[citation needed] Sotero and Eulogio Aranguren were the first Argentine men's footballers who played for Real Madrid.