Patrick Maley, aged 13, was last seen leaving a home on Gould Avenue, Lewisham, about 9.30am on Monday 20 May 2019.
Officers from Inner West Police Area Command were notified the following day (Tuesday 21 May 2019) and commenced inquiries.
He has not been seen or heard from since and family and police hold concern for his welfare.
Patrick is described as being of Caucasian appearance, about 170cm to 175cm tall, of thin build, with brown hair and brown eyes.
He was last seen wearing a white and grey jumper, black pants, a black cap and bumbag.
Patrick is known to frequent the Sydney CBD, Belmore, and Bankstown areas.
Anyone with information on Patrick’s whereabouts is urged to contact police immediately via Crime Stoppers: 1800 333 000 or https://nsw.crimestoppers.com.au.