DEC Alpha，也称为Alpha AXP，是由迪吉多公司开发的64位RISC指令集架构微处理器。最初由DEC公司制造，并被用于DEC自己的工作站和服务器中。作为VAX的后续被开发，支持VMS操作系统，如Digital UNIX。不久之后开放源代码的操作系统也可以在其上运行，如Linux和BSD。Microsoft Windows支持这款处理器，直到Windows NT 4.0 SP6，但是从Windows 2000 beta3开始放弃了对Alpha的支持。

1998年，随着DEC被一起卖给康柏。2001年，被康柏卖给Intel。同年，惠普收购康柏，继续开发基于Alpha处理器的产品到2004年。

Alpha, originally known as Alpha AXP, is a 64-bit reduced instruction set computing (RISC) instruction set developed by Digital Equipment Corporation (DEC), designed to replace their 32-bit VAX complex instruction set computer (CISC) instruction set. Alpha was implemented in microprocessors originally developed and fabricated by DEC. These microprocessors were most prominently used in a variety of DEC workstations and servers, which eventually formed the basis for almost all of their mid-to-upper-scale lineup. Several third-party vendors also produced Alpha systems, including PC form factor motherboards.