Emergency services were called to Mill Lane on Saturday (October 8).
Police said a grey Mini One, travelling north, and a silver Ford Galaxy, travelling south, collided at about 4.45pm.
A 20-year-old Storrington man, who was driving the Mini, was treated for serious injuries and was rushed to hospital. Police said he is currently in a life-threatening condition.
A 35-year-old woman, from Pulborough, suffered a broken hand, officers added.
The road was closed throughout the evening whilst the incident was dealt with.
Anyone who witnessed the crash is asked to contact police on [email protected] quoting Operation Arnfield.
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