《国际藻类、真菌、植物命名法规》（英语： International Code of Nomenclature for algae, fungi, and plants；ICN）是一部关于植物命名的规则与建议，其中确立每一个分类单元（或分类群, taxon）只有一个正确的学名。此规则通行于全世界，更改必须经由国际植物学会议（International Botanical Congress, IBC）的讨论。全部的事项皆由国际植物分类学学会组织完成。

The International Code of Nomenclature for algae, fungi, and plants (ICN) is the set of rules and recommendations dealing with the formal botanical names that are given to plants, fungi and a few other groups of organisms, all those "traditionally treated as algae, fungi, or plants". It was formerly called the International Code of Botanical Nomenclature (ICBN); the name was changed at the International Botanical Congress in Melbourne in July 2011 as part of the Melbourne Code which replaces the Vienna Code of 2005. As with previous codes, it takes effect as soon as ratified by the congress (on Saturday 23 July 2011), but the documentation of the code in its final form takes some time to prepare after the congress. Preliminary wording of some of the articles with the most significant changes has been published in September 2011.