| Category: | Group 5 |
| Chassis: | aluminium monocoque with carbon-fibre reinforcements |
| Suspension: | double wishbones, push-rod actuated coil springs over shock absorbers, anti-roll bar |
| Engine Name: | BMW M12/7 |
| Capacity: | 21NaN1 |
| Configuration: | I4, |
| Turbo/Na: | naturally-aspirated, |
| Engine Position: | mid-engined |
| Gearbox Name: | Hewland FT200 |
| Gears: | 5-speed |
| Type: | manual |
| Debut: | 1973 1000km of Monza[1] |
The March 73S is a Group 5 prototype race car, designed, developed and built by British manufacturer March Engineering, for sports car racing, in 1973.[2]