A rider has been taken to hospital in a critical condition after a two-vehicle crash in Brisbane's north-west.

Emergency services were called just after 1pm on Saturday after a motorbike and vehicle crashed near the corner of Inverness Street and Canvey Road in Upper Kedron.

The patient was taken to Royal Brisbane Women's Hospital after being treated by a high acuity response unit and critical care paramedics.

A police spokesman said the forensic crash unit was on scene investigating whether speed could have been a factor.