中断矢量（Interrupt vector）是中断服务进程的入口地址，或中断矢量表（它是一个数组）的下标，中断服务进程的入口地址存放在该数组中。

系统程序必须维护一份中断矢量表，这是一个很单纯的表格，每一个entry纪录一个地址，这个地址指到一段程序(或说一个函数)，称为中断处理程序(或ISR，Interrupt Service Routine)

An interrupt vector table (IVT) is a data structure that associates a list of interrupt handlers with a list of interrupt requests in a table of interrupt vectors. An interrupt vector is the address of the interrupt handler. While the concept is common across processor architectures, each IVT may be implemented in an architecture-specific fashion. For example, a dispatch table is one method of implementing an interrupt vector table.