律贼（俄罗斯语：вор в законе voř v zakone；乌克兰语：злодій у законі zlodiy u zakoni；白俄罗斯语：злодзей у законе zlodzey v zakone；格鲁吉亚语：კანონიერი ქურდი kanonieri kurdi；亚美尼亚语：օրենքով գող orenk'ov goğ；阿塞拜疆语：Qanuni oğru；英语：Thief in laws；更明了的译法为「服从盗贼『律例』的罪犯」）指在前苏联、前苏联国家和俄罗斯的黑手党中拥有某程度的权力和高端的地位并受到尊敬的罪犯。律贼是后苏维埃世界中有组织犯罪中的精英份子，他们的地位相当于意大利黑手党的「教父。据俄罗斯新闻渠道报道，独立的有组织犯罪集团大概有百余个。据此估计，全球律贼的数量大概在数百与一万之间。律贼并不局限于俄罗斯裔，很多都是来自不同的国家，包括一些前苏联国家或前华沙公约国家，例如波兰、捷克共和国和保加利亚。

A thief in law (Russian:вор в зако́не, tr.vor v zakone; Estonian: varas seaduses; Ukrainian:злодій у законі, zlodiy u zakoni; Belarusian:злодзей у законе, zlodzey u zakone; Georgian:კანონიერი ქურდი, kanonieri kurdi; Armenian:օրենքով գող, orenk'ov goğ; Azerbaijani:Qanuni oğru) in the Soviet Union, the post-Soviet states and respective diasporas abroad is a specifically granted formal status of a professional criminal who enjoys an elite position within the organized crime environment and employs informal authority over its lower-status members. Each new Vor is vetted (literally "crowned", with respective rituals and tattoos) by consensus of several Vors. Vor culture is inseparable from prison organized crime: only repeatedly jailed convicts are eligible for Vor status. Thieves in law are drawn from many nationalities from a number of post-Soviet states.