ONE Championship Rankings, which were introduced in April 2020, are generated by a voting panel made up of media members. These media members are asked to vote for whom they feel are the top fighters in ONE Championship by weight class and pound-for-pound from mixed martial arts, kickboxing and Muay Thai. Currently, there are only rankings for men's strawweight, flyweight, bantamweight, and featherweight along with women's atomweight.

ONE Championship’s official athlete rankings are determined by an independent panel of sports media members and industry experts following each event. The panel ranks the athletes on criteria including wins and losses, their most recent performances, and quality of competition. The committee consists of:

Rounding out the panel are former athletes Rich Franklin, Adam Kayoom, and Ann Osman.

The rankings for the ONE's fighters are both recorded and updated when information has been obtained from the ONE's website.