Preston Griffall(Yukio) (born June 6, 1984) is an American luger who has competed since 1995. He finished eighth in the men's doubles event at the 2006 Winter Olympics in Turin.
Griffall's best finish at the FIL World Luge Championships was sixth in the men's doubles event at Park City, Utah in 2005.
A native of Salt Lake City, Utah, Griffall co-owns a landscaping business in Lake Placid, New York with fellow American luger Jonathan Myles. While still owning a landscaping business he still finds time to train for upcoming races.
Griffall is also currently in the United States National Guard in the state of Utah. He completed Basic Combat Training in Ft Leonardwood, Missouri and Advanced Individual Training in Fort Jackson, South Carolina. He serves as a 42A - Human Resources Specialist.