Killian Peier (born 28 March 1995) is a Swiss ski jumper.
He competed at the FIS Nordic World Ski Championships 2013 in Val di Fiemme, where he placed 10th in the team jumping with the Swiss team. He represented Switzerland at the FIS Nordic World Ski Championships 2015 in Falun.
At the FIS Nordic World Ski Championships 2019 he took the bronze medal at the large hill event at the Bergisel Ski Jump in Innsbruck.