墨角兰（学名：Origanum majorana），隶属于唇形科牛至属，是一种有点对寒冷敏感的多年生香草，带有甜松和柑橘的香味。墨角兰又名马郁草、马约兰草、甜墨角兰（Sweet Marjoram）、多节墨角兰（Knotted Marjoram）及马乔兰(Marjoram)。叶对生，卵圆形，具顶生伞房花序，开白色或紫色花朵。

墨角兰（marjoram）一词（古法语：majorane、中古拉丁语：majorana）并不是直接源于拉丁词maior（主要）。墨角兰原产地是在地中海，后来希腊人和罗马人将这种植物视为幸福的象征。

Marjoram /ˈmɑːrdʒərəm/ (Origanum majorana, syn. Majorana hortensis Moench, Majorana majorana (L.) H. Karst) is a somewhat cold-sensitive perennial herb or undershrub with sweet pine and citrus flavors. In some Middle Eastern countries, marjoram is synonymous with oregano, and there the names sweet marjoram and knotted marjoram are used to distinguish it from other plants of the genus Origanum. It is also called pot marjoram, although this name is also used for other cultivated species of Origanum.