最古老与最高贵的蓟花勋章（The Most Ancient and Most Noble Order of the Thistle）是授予苏格兰骑士的一种勋章，它现在的版本是英国国王詹姆斯二世在1687年时所制定的。蓟花勋章的配戴者极为稀少，在一般情况下，除英国国君以外，在世的受勋者只有16人。但英国国君有权再额外授予其他人蓟花勋章，如英国王室成员与外国国君等。与其它勋章不同的是，只有英国国君才有资格授予蓟花勋章，而毋需经过英国首相的建议或提名。

蓟花勋章最重要的标志就是苏格兰的国花蓟花。勋章的格言是：「犯我者必受惩。」（拉丁文：Nemo me impune lacessit.），相同的格言也出现在英国王室在苏格兰使用的王室徽章与部份英镑硬币上，同时它也是苏格兰皇家军团与苏格兰皇家骑兵卫队的格言。蓟花勋章的主保圣人是耶稣十二门徒之一的圣安德烈。

The Most Ancient and Most Noble Order of the Thistle is an order of chivalry associated with Scotland. The current version of the Order was founded in 1687 by King James VII of Scotland (James II of England and Ireland) who asserted that he was reviving an earlier Order. The Order consists of the Sovereign and sixteen Knights and Ladies, as well as certain "extra" knights (members of the British Royal Family and foreign monarchs). The Sovereign alone grants membership of the Order; he or she is not advised by the Government, as occurs with most other Orders.