German citizen Lars Mittank disappeared from Varna Airport, Bulgaria; his last known movements were widely watched on YouTube.

Lars Joachim Mittank is a German man who disappeared on 8 July 2014, near Varna Airport in Varna, Bulgaria. Mittank was on holiday at the Golden Sands resort, where he was supposedly involved in a fight, and was unable to fly home with his friends for health reasons. Mittank was documented acting strangely while alone in Bulgaria. He called home to his mother claiming that people were trying to kill him. On the day when he was supposed to fly home, Mittank went to the Varna Airport to consult with a doctor. He was later seen on airport security footage running out of the airport and towards an adjacent forest. He has never been seen since. The case has generated intense interest, and the frequency with which people viewed the footage of him fleeing the airport has led to him being named most recently as the most famous missing tourist in the world and also "the most famous missing person on YouTube".

Varna Airport is the airport of Varna, the historical maritime capital of Bulgaria. Varna Airport is the third largest airport in Bulgaria. It is located 10 kilometers from the center of Varna near the town of Aksakovo. The airport serves Varna, Golden Sands and northeastern Bulgaria. The busiest season for the airport is from the end of May to the beginning of October.

YouTube is an American social media and online video sharing platform owned by Google. YouTube was founded on February 14, 2005, by Chad Hurley, Jawed Karim, and Steve Chen, who were former employees of PayPal. Headquartered in San Bruno, California, it is the second-most-visited website in the world, after Google Search. In January 2024, YouTube had more than 2.7 billion monthly active users, who collectively watched more than one billion hours of videos every day. As of May 2019, videos were being uploaded to the platform at a rate of more than 500 hours of content per minute, and as of mid-2024, there were approximately 14.8 billion videos in total.