Indianapolis 500 in 1921
De 9e Indianapolis 500 werd gereden op maandag 30 mei 1921 op de Indianapolis Motor Speedway. Amerikaans coureur Tommy Milton won de race.
Startgrid

| Rij | Binnen | Midden | Buiten |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 | |||
| 8 |
¹ Italiaan Ralph DePalma werd in 1920 Amerikaans staatsburger.
Race
| # | Coureur | Auto | Ronden | Opgave | |
|---|---|---|---|---|---|
| 1 | Frontenac | 200 | |||
| 2 | Duesenberg | 200 | |||
| 3 | Frontenac | 200 | |||
| 4 | Duesenberg | 200 | |||
| 5 | Sunbeam | 200 | |||
| 6 | Duesenberg | 200 | |||
| 7 | Leach-Miller | 200 | |||
| 8 | Duesenberg | 200 | |||
| 9 | Frontenac | 177 | |||
| 10 | Sunbeam | 144 | Mechanisch | ||
| 11 | Frontenac | 133 | Mechanisch | ||
| 12 | Ballot | 112 | Mechanisch | ||
| 13 | Duesenberg | 111 | Mechanisch | ||
| 14 | Duesenberg | 107 | Ongeval | ||
| 15 | Brett | 91 | Ongeval | ||
| 16 | Frontenac | 87 | Mechanisch | ||
| 17 | Duesenberg | 74 | Mechanisch | ||
| 18 | Peugeot | 65 | Mechanisch | ||
| 19 | Frontenac | 49 | Mechanisch | ||
| 20 | Sunbeam | 41 | Mechanisch | ||
| 21 | Brett | 33 | Ongeval | ||
| 22 | Duesenberg | 25 | Ongeval | ||
| 23 | Peugeot | 22 | Mechanisch | ||
| Gemiddelde snelheid : 144,231 km/h | |||||