World number 1

World number 1 or world no. 1 refers to the highest world ranking in several competitive sports:

• List of FIDE chess world number ones, in chess
• List of PSA women's number 1 ranked players, women's squash
• List of world number one male golfers, in men's golf
• List of World Number One female golfers, in women's golf
• List of world number one snooker players, in snooker
• World number 1 ranked tennis players, in tennis