| NPSI | NCP (Network Control Program) Packet Switching Interface | NCP（网络控制程序）分组交换接口 |
| NPSI | American National Straight Intermediate Pipe Thread | 美国国家直通中间管螺纹 |
| NPSI | Network Control Program Packet Switch Interface | 网络控制程序分组交换接口 |
| NPSI | National Prep School Invitational | 全国预科学校邀请赛 |
| NPSI | North Pittsburgh Systems (stock symbol) | 北匹兹堡系统（股票符号） |
| NPSI | National Playground Safety Institute | 国家游乐场安全研究所 |
| NPSI | North Pittsburgh Systems, Inc. | 北匹兹堡系统公司。 |