The 2004 United States Grand Prix was a Formula One motor race held on June 20, 2004, at the Indianapolis Motor Speedway in Speedway, Indiana. It was Race 9 of 18 in the 2004 FIA Formula One World Championship.

Rubens Barrichello started from pole position in his Ferrari ahead of teammate Michael Schumacher. However, following a start-line incident between five cars, four of whom retired as a result, Schumacher overtook Barrichello on the safety car restart on lap six, and despite a threat from Barrichello after the final pit stops, Schumacher held on to take his eighth win of the season. Takuma Sato became only the second Japanese driver to achieve a podium finish after Aguri Suzuki.

The race saw two serious accidents caused by Michelin tire failures in what would be a precedent for the 2005 United States Grand Prix. First, Fernando Alonso's Renault crashed into the barriers alongside the end of the pit straight on lap nine. Later, Ralf Schumacher's Williams suffered the same fate, but in the most dangerous part of the track, causing him to hit the wall at a ninety-degree angle rearwards. The impact left Schumacher with spinal fractures and concussion, which prevented him from racing until the 2004 Chinese Grand Prix, three months later.