Luka Janežič is a Slovenian sprinter. He competed in the 400 metres event at the 2015 World Championships in Beijing without advancing from the first round. In the 2016 Olympic Games, Janežič advanced to the 400 m semifinals and exceeded his own national record in the event.

The men's 400 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 23, 24 and 26 August.