虞美人（学名：Papaver rhoeas），又名丽春花、赛牡丹、满园春、仙女蒿、虞美人草、雏芥子、雏罂粟、小种罂粟花、蝴蝶满春，罂粟科罂粟属草本植物，花期夏季，花色有红、白、紫、蓝等颜色，浓艳华美。原产于亚欧温带大陆，在古代中国即有大量栽培，现已引种至新西兰、澳大利亚和北美。

为罂粟花的一种，在欧洲又称谷物罂粟花（corn poppy）、谷物玫瑰（corn rose）、田野罂粟花（field poppy）、法兰德斯罂粟（Flanders poppy）、红罂粟花（red poppy）、红杂草（red weed）。因为它繁殖力强，常生长于农田，农民容易将它误认是小麦、燕麦而未拔除，在欧洲农田被视为是一种杂草。为比利时的国花。在英国的国殇纪念日中，有佩带虞美人来纪念第一次世界大战阵亡士兵的传统，因此又称国殇罂粟花。

Papaver rhoeas (common names include common poppy, corn poppy, corn rose, field poppy, Flanders poppy, red poppy, red weed, coquelicot, and, due to its odour, which is said to cause them, as headache and headwark) is an annual herbaceous species of flowering plant in the poppy family, Papaveraceae. This poppy is notable as an agricultural weed (hence the common names including "corn" and "field") and after World War I as a symbol of dead soldiers.