Northern Territory Police have concerns for the welfare of 19 year-old German national Simone Lieschke.

Miss Lieschke arrived in Darwin on June 27, 2013 and has not been in contact with friends or her family since this time.

Miss Lieschke had been in regular contact since arriving in Australia and it is out of character for her to have not spoken to anyone since last Thursday.

Miss Lieschke is described as being Caucasian, 156 cm tall, shoulder length light brown hair and brown eyes.

Anyone who has seen Simone since she arrived in Darwin or has information that may assist Police in contacting her is urged to phone the Police Assistance Line on 131 444 or contact Crime Stoppers on 1800 333 000.