| ITSI | Information Technology Standards Institute | 信息技术标准协会 |
| ITSI | Intelligent Transportation Systems Institute (University of Minnesota) | 智能交通系统研究所（明尼苏达大学） |
| ITSI | Innovative Technical Solutions Inc (Walnut Creek, CA) | Innovative Technical Solutions Inc（加州Walnut Creek） |
| ITSI | International Lottery & Totalizer Systems, Inc. | 彩票和Totalizer国际有限公司 |