The Codex Alimentarius Commission with the Food and Agriculture Organization (FAO) of the United Nations is the organization directly responsible for setting standards and policies on food labeling all over the world. Each country has its own regulatory bodies.
In the United States, it is the Food Labeling and Claims that specifically regulates food labels. However, the FDA food labeling guide focuses on nutrition facts, as their office is responsible for ensuring that all food products sold in the country are safe and nutritious.