The 1975 Spanish Grand Prix was a Formula One motor race held at Montjuïc circuit on 27 April 1975. It was race 4 in the 1975 Formula One season. Lella Lombardi became the first and only woman to score points in the World Championship. Lombardi scored 0.5 points as this was the first time a race was stopped before 60% completion leading to the awarding of half the points that would be awarded for a completed race. During the race, a spectator, a fireman and two journalists were hit by the Hill GH1 of Rolf Stommelen, after he crashed and landed in a spectator area, causing their deaths. The race was also future world champion Alan Jones' first Grand Prix start.

The race was shortened to 29 of its scheduled 75 laps, a race distance of 109 kilometres. The race was won by German driver Jochen Mass driving a McLaren M23. It would be the only Formula One win of his career. Mass had just a second lead over the Lotus 72E of Belgian driver Jacky Ickx when the race was declared. Argentine racer Carlos Reutemann was declared third in his Brabham BT44B, a lap behind the race leaders after a penalty was given to Jean-Pierre Jarier. This was the last win by a German driver until Michael Schumacher won the 1992 Belgian Grand Prix.