Schedule 3/Schedule III may refer to:
- Third Schedule of the Constitution of India, relating to oaths and affirmations
- Schedule III Controlled Substances within the US Controlled Substances Act
- Schedule III Controlled Drugs and Substances within the Canadian Controlled Drugs and Substances Act
- Schedule III Psychotropic Substances within the Thai Psychotropic Substances Act
- Schedule III Psychotropic Substances within the U.N. Convention on Psychotropic Substances
- Schedule III Banks within the Canada Bank Act
- Schedule 3 compounds within the Chemical Weapons Convention