- YEI stands for Yang Enterprises, Inc. (Oviedo, FL)
- YEI stands for Youth Employment Institute (alternative high school; Portland, OR)
- YEI stands for Youth Employment Initiative
- YEI stands for Yamaha Exporting, Inc. (Buena Park, CA)
- YEI stands for Yahalomei Espeka International Ltd. (manufacturer; Israel)
- YEI stands for Youth for Energy Independence
- YEI stands for Yuasa/Exide, Inc. (now Enersys, Inc.; Reading, PA)
YEI