Athletic Bilbao B
Bilbao Athletic, officially named Athletic Club "B", is the reserve team of Athletic Bilbao, a football club based in Bilbao, in the autonomous community of Basque Country. The team will play in the Segunda División B in the 2018–19 season. Founded in 1964, the team holds home matches at the small stadium attached to the club's training facility at Lezama, or occasionally at San Mamés Stadium, with its 53,500-seat capacity, for important fixtures.
Copa del Rey
‡ Counting the 1913 win by Racing de Irún, which merged with Irún Sporting Club in 1915 to form Real Unión. 
‡‡ Real Madrid's reserve team. Reserve teams were banned for this competition for first time in the 1990–91 competition.
‡‡‡ The number of wins Athletic Bilbao have been credited with is disputed. The 1902 version was won by Bizcaya, a team made up of players from Athletic Club and Bilbao FC. In 1903 these two clubs merged as the current Athletic Club. The 1902 cup is on display in the Athletic museum and the club includes it in its own honors list.