This is a list of Spanish football transfers for the summer sale in the 2017–18 season of La Liga and Segunda División. Only moves from La Liga and Segunda División are listed.
The summer transfer window began on 1 July 2017, although a few transfers took place prior to that date. The window closed at midnight on 1 September 2017. Players without a club can join one at any time, either during or in between transfer windows. Clubs below La Liga level can also sign players on loan at any time. If needed, clubs can sign a goalkeeper on an emergency loan, if all others are unavailable. Unless noted, all of the clubs without a flag are from Spain.
Manager: Luis Zubeldía (1st season)
Manager: José Ángel Ziganda (1st season)
Manager: Diego Simeone (7th season)
Manager: Ernesto Valverde (1st season)
Manager: Juan Carlos Unzué (1st season)
Manager: Pepe Mel (2nd season)
Manager: José Luis Mendilibar (3rd season)
Manager: Quique Sánchez Flores (2nd season)
Manager: José Bordalás (2nd season)
Manager: Pablo Machín (5th season)
Manager: Manolo Márquez (1st season)
Manager: Asier Garitano (5th season)
Manager: Juan Muñiz (2nd season)
Manager: Míchel (2nd season)
Manager: Quique Setién (1st season)
Manager: Zinedine Zidane (3rd season)
Manager: Eusebio Sacristán (3rd season)
Manager: Eduardo Berizzo (1st season)
Manager: Marcelino (1st season)
Manager: Fran Escribá (2nd season)
Manager: José Manuel Aira (2nd season)
Manager: Julio Velázquez (2nd season)
Manager: Luis Miguel Ramis (2nd season)
Manager: Gerard López (3rd season)
Manager: Álvaro Cervera (3rd season)
Manager: Luis Carrión (2nd season)
Manager: Rubén de la Barrera (2nd season)
Manager: Lluís Carreras (1st season)
Manager: José Luis Oltra (1st season)
Manager: Rubi (1st season)
Manager: Curro Torres (1st season)
Manager: Francisco (1st season)
Manager: Jagoba Arrasate (3rd season)
Manager: Diego Martínez (1st season)
Manager: Juan Antonio Anquela (1st season)
Manager: Aritz López Garai (1st season)
Manager: Luis Tevenet (1st season)
Manager: Paco Herrera (1st season)
Manager: José Luis Martí (3rd season)
Manager: Luis César Sampedro (1st season)
Manager: Natxo González (1st season)
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