御用大律师（英文：Queen's Counsel、简称QC，通译御用大律师，中国大陆译皇室法律顾问或王室法律顾问，马来西亚译女皇律师）是部分英联邦王国中资历较深的大律师（讼务律师）的资格头衔，也可泛指获得此资格的大律师。

虽然此称号直译为“女王的（法律）顾问”（男性君主在位时称“国王的（法律）顾问”），但当代的头衔拥有者并不因此具有担任王室法律顾问的权利或职责，实际上王室和其他当事人一样，会雇用事务律师、初级大律师和资深（御用）大律师。相应的，大多数御用大律师也不会为女王提供法律意见，除了资格较深、职责较高以外，其专业事务和无此头衔的初级大律师本质上无异。在英格兰和威尔士，御用大律师大概占总数一万多大律师中的10%。

Queen's Counsel (postnominal QC), or King's Counsel (postnominal KC) during the reign of a king, are particularly eminent lawyers, mostly barristers, appointed by letters patent to be one of "Her Majesty's Counsel learned in the law." It is also recognised as an honorific. Membership exists in various Commonwealth jurisdictions around the world, while in some other jurisdictions the name has been replaced by one without monarchical connotations, such as "Senior Counsel" or "Senior Advocate". Queen's Counsel is a status, conferred by the Crown, that is recognised by courts. Members have the privilege of sitting within the Bar of court.