Police are appealing for witnesses after a pedestrian was critically injured in a crash in Timaru.

A police spokesperson said emergency services were called to a collision involving a vehicle and a pedestrian near the intersection of Wai iti Road and Wilson Street about 11.40am on Tuesday.

The pedestrian remained in hospital in a critical condition.

Police want to hear from anyone who witnessed the crash or has relevant security camera or dashcam footage.

Anyone with information can contact police through the 105 website or by calling 105 and quoting file number 260818/9739.