Police have "serious concerns" for a Canterbury man who vanished a week ago.

Christopher May has been missing since June 30 when he was last seen by friends after he failed to show up for a lunch appointment.

Christchurch Police said they have concerns for the 30-year-old's welfare and want to reunite him with his family.

Police asked anyone who has seen May or has any information about his disappearance to contact Christchurch Police (03) 363 7400.

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Alternatively people can provide information anonymously to Crimestoppers on 0800 555 111.