The ambulance service was called to the incident near Bond Street Station around 6.45pm yesterday (May 31).
Paramedics arrived and an air ambulance also landed nearby.
Oxford Street was closed by the police into the night with three buses inside a cordon.
The condition of the woman and the nature of her injuries are not known.
The Metropolitan Police have been contacted for further information.
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A London Ambulance Service spokesperson said: “We were called at 6.42pm (31 May) to reports of a road traffic collision near Bond Street Station, W1C.
“We sent multiple resources to the scene, including a paramedic in a fast response car, an ambulance crew and an incident response officer. We also dispatched London’s Air Ambulance.
“We treated a patient at the scene before taking them to a major trauma centre.”
