虚拟地址（英语：Virtual address space）在电脑的专用术语中是指标识一个虚拟（非物理地址）的实体地址。虚拟地址这个术语常用在虚拟内存和虚拟网络地址当中。

In computing, a virtual address space (VAS) or address space is the set of ranges of virtual addresses that an operating system makes available to a process. The range of virtual addresses usually starts at a low address and can extend to the highest address allowed by the computer's instruction set architecture and supported by the operating system's pointer size implementation, which can be 4 bytes for 32-bit or 8 bytes for 64-bit OS versions. This provides several benefits, one of which is, if each process is given a separate address space, security through process isolation.