鸢尾科（学名：Iridaceae），显花植物的一科，属天门冬目。这个科包括了许多常见的植物，像番红花和小苍兰。本科植物主要用于观赏，有些可以作为药用或提取芳香油。

• 多年生草本；
• 地下有根茎、球茎或鳞茎，茎单生或成束由地下茎生出；
• 叶常基生，剑形或线形，基部鞘状，嵌迭成2列；
• 两性花，由一鞘状苞内抽出，形似蝴蝶，花被呈花瓣状，6裂，排成2列，有白、红、黄、蓝、紫等颜色，并常有美丽的斑点或斑纹，雄蕊3枚，子房下位，3室，中轴胎座，花柱1个，柱头3个，有时扩大而呈花瓣状或分裂；
• 果实为蒴果。

Iridaceae is a family of plants in Order Asparagales, taking its name from the Irises. It includes a number of other well known cultivated plants, such as the Freesia, the Gladiolus and the Crocus.

Members of this family are perennial plants, with a bulb, corm or rhizome. The plants grow erect, and have leaves that are generally grass-like, with a sharp central fold. Some examples of members of this family are the Blue Flag and Yellow Flag.