The 1989 McLaren season was McLaren's 24th season as a constructor. It won its fifth constructors' championship, but its season was overshadowed by controversy, when Ayrton Senna and Alain Prost collided in the Japanese Grand Prix. Prost jumped from his car. Senna, however, got a push from the marshals and returned to the track. After winning the race, however, it was revealed that he had missed the chicane following his altercation with Prost so he was disqualified.
The Australian Grand Prix was overshadowed by the ongoing controversy surrounding the Japanese race, but once the appeals had been considered, Prost was crowned the champion for the third time.