Willi Kaltschmitt Luján (born 13 August 1939) is a Guatemalan businessman, sports administrator, and former ambassador.
He was ambassador to Cuba from 1998 to 2000.He is a member of the executive board of the International Olympic Committee (IOC) since 2012 and is expected to retire at the end of 2019, as per protocol, as he will turn 80 during the year.He is also a member of the World Baseball Softball Confederation executive board.