Officers are appealing for witnesses following a collision on the Wellingborough Road near Abington Park.
The collision happened at about 9.10am at the junction with Wantage Road, when a red car was in collision with a female cyclist who sustained serious injuries.
The incident happened on Friday, February 8 2019, Northamptonshire Police today confirmed.
Witnesses to the collision, or anyone with information, should contact the Northamptonshire Police RTC Process Team on 101 extension 341992, quoting reference 19000090359