维诺那计划（英语：Venona project）是美国和英国的情报机构联手合作进行的一项长期的的秘密情报收集和分析任务，目的在截获和破译苏联情报机关（大部分在二战期间）所发出的消息。美英两国的情报机关（其中包括****）先后使用过13个代号来代表这一计划，最后使用的代号叫做“维诺那”。“维诺那”这个代号没有任何实际含义（在****局解密文档中，“维诺那”用大写字母“VENONA”来表示，但是小写的写法通常为公众所用）。

在冷战开始的头几年中，维诺那计划是由西方军事部门领导的用于收集苏联情报机构信息的一个计划。尽管它并不为公众所知，甚至对罗斯福和杜鲁门总统都处于保密状态，但是这个计划却对于冷战早期的一系列重大事件有着重要的影响。这包括罗森堡夫妇间谍案以及唐纳德·麦克莱恩（Donald Maclean）和盖伊·伯吉斯（Guy Burgess）叛逃苏联一事。

The Venona project was a counter-intelligence program initiated by the United States Army Signal Intelligence Service (a forerunner of the National Security Agency) that lasted from 1943 to 1980. The program attempted to decrypt messages sent by Soviet Union intelligence agencies, including its foreign intelligence service and military intelligence services. During the program's four decades, approximately 3,000 messages were at least partially decrypted and translated. The project produced some of the most important breakthroughs for western counter-intelligence in this period, including the discovery of the Cambridge spy ring and the exposure of Soviet espionage targeting the Manhattan Project. The project was one of the most sensitive secrets of United States intelligence. It remained secret for over a decade after it ended and was not officially declassified until 1995.