Police are looking for a middle-aged man who made an unwanted approach to a teenage girl last night in Christchurch.

The 16-year-old girl was approached by a man as she walked along Main South Road in Hornby, west of Garvins Road, about 6pm yesterday, police said.

The man was described as being in his 40s to 50s, with dark hair and a bushy beard, wearing grey tracksuit pants and a black jumper.

He was travelling in an older model, four-door Nissan Skyline-type vehicle, silver/grey in colour.

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Police are seeking the public's assistance in identifying this man.

Anyone with information or who saw anything unusual can contact Detective Craig Lattimore on (03) 363 7400.

"This is a reminder to take extra care and ensure you remain alert to your surroundings during dark winter evenings, and to report any unusual vehicles or people to police," Lattimore said.