March 73S

{{Short description|Sports prototype race car}}

{{Infobox racing car

| Image = Paris - Retromobile 2012 - March 73S - 1973 - 001.jpg

| 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 = {{convert|2.0|L|cuin|1|abbr=on}}

| Configuration = I4,

| Turbo/NA = naturally-aspirated,

| Engine position = mid-engined

| Power = {{cvt|300|hp|kW}}

| Gearbox name = Hewland FT200

| Gears = 5-speed

| Type = manual

| Weight = {{cvt|700|kg|lb|0|abbr=on}}

| Differential =

| Fuel =

| Lubricants =

| Tires =

| Entries =

| Podiums =

| Predecessor =

| Debut = 1973 1000km of Monza{{Cite web|url=http://tech-racingcars.wikidot.com/march-73s|title=March 73S group 5 (1973) - Racing Cars|website=tech-racingcars.wikidot.com}}

}}

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.{{Cite web|url=https://www.conceptcarz.com/z27172/march-73s.aspx|title=1973 March 73S|website=conceptcarz.com}}