Willi Sten Railo (22 March 1941 – 8 July 2010) was a Norwegian sport psychologist and professor of performance psychology.
He became known nationally for his 1986 book Best når det gjelder ("Best When it Counts").
Since the 1980s, he worked as a consultant for Swedish football manager Sven-Göran Eriksson, and continued in this position also during the latter's stint as manager for the English national football team.
He also worked with the Norwegian football club VÃ¥lerenga in 2005, when the club won the Norwegian Premier League.
In the Norwegian Athletics Association he was a member of the medical committee in 1978 and 1980.