A North Shore woman has issued a plea for sightings of her teenage daughter who hasn't been seen since Friday.

Tracey Stewart posted an emotional message to Facebook on Sunday evening about her daughter Mia. The 15-year-old, who lives on Auckland's Hibiscus Coast, has been missing all weekend.

Ms Stewart says Mia hasn't used her phone or the internet since the early hours of Saturday morning, and had spent the evening with "people she doesn't know very well".

"This is by far the hardest thing I have had to write and we do not want or need anyone's judgement, gossip or speculation," Ms Stewart wrote.