Domingo Careaga Achalandabaso (3 August 1897 - 29 August 1947) was a Spanish footballer who played as a defender for Arenas de Getxo.^[1] Careaga spent all 14 seasons of his playing career with Arenas de Getxo, thus being a historical member of the club and part of the so-called one-club men group. He also played in four matches for the Spain national football team between 1921 and 1923.^[2]

Born in Getxo, he began his career at his hometown club Arenas de Getxo in 1916, and he remained loyal to the club for the next 14 years. He played a pivotal role in helping the Copa del Rey final on two occasions, in 1917 and 1919, which ended in a loss to Real Madrid and in a 5–2 win over FC Barcelona.^[3]

He made his debut for the Spanish national team on 9 October 1921 against the 1920 Summer Olympics gold medalists Belgium, keeping a clean-sheet in a 2-0 win. In his next cap on 16 December 1923 he scored again, netting a hat-trick in the Iberian derby to help his side to a 3-0 win. In total, he earned 4 caps in which he only conceded one goal.^[2]

Like many other Arenas de Getxo players of that time, he played a few games for the Biscay national team, participating in both the 1922–23 and the 1923–24 Prince of Asturias Cups, an official inter-regional competition organized by the RFEF.^[4] In the quarter-finals of the 1922–23 edition against Asturias, Careaga slotted a penalty in the 132nd minute of extra-time to level the scores at 3–3, but they were ultimately eliminated 3–4 courtesy of a brace from Rogelio Barril.^[5]