- YAG stands for Yttrium Aluminum Garnet
- YAG stands for You Are Great
- YAG stands for Youth and Government (Young Men’s Christian Association)
- YAG stands for Youth Advisory Group (various locations)
- YAG stands for Miscellaneous Auxiliary (Self-Propelled)
- YAG stands for You Are Gay
- YAG stands for District Auxiliary, Miscellaneous (US Navy)
- YAG stands for Young Alumni Group (various universities)
- YAG stands for Yet Another Game (gaming feedback online)
- YAG stands for Young-at-Art Gallery (Noyes Museum of Art; Oceanville, NJ)
YAG