Police are appealing for public assistance to locate two teenage boys and a teenage girl who were last seen in Kiama on Monday night.

Todd Fowler, aged 13, Tristan Coward, aged 13, and Jordyn Boyle, aged 16, were all last seen in Kiama about 10.40pm on Monday and when they were unable to be located or contacted, Lake Illawarra Police District officers were notified and started inquiries into their whereabouts.

Police and family hold concerns for the welfare of Todd, Tristan and Jordyn given their ages.

Todd is described as being of Caucasian appearance, about 160cm tall, slim build with short blond hair, blue eyes, and was last seen wearing a light blue shirt and dark blue shorts.

Tristan is described as being of Caucasian appearance, about 160cm tall, slim build with light brown short hair, blue eyes, and was last seen wearing a white hooded jumper, dark coloured pants and white sneakers.

Jordyn is described as being of Caucasian appearance, about 160cm tall, slim build with blonde hair, blue eyes, and was last seen wearing a black hooded jumper with green writing.

The group is believed to be together and is known to frequent Dapto, Unanderra and Shellharbour.

Lake Illawarra Police are also appealing for help to find another teenager who was last seen at a skate park at Ash Avenue in Albion Park Rail, about 9am on Tuesday.

Mariah Schnepf, 13, is described as being of Caucasian appearance, about 155cm tall, with an olive complexion, and brown hair.

She was last seen wearing a black hooded jumper with pink writing and white tracksuit pants.

Mariah is known to frequent the Dapto, Wollongong and Albion Park Rail.

Anyone with information into the whereabouts of the four missing teens is urged to call Lake Illawarra Police or Crime Stoppers on 1800 333 000.