国殇纪念日（英语：Remembrance Day）订立于每年的11月11日，为一个纪念在第一次世界大战、第二次世界大战和其他战争中牺牲的军人与平民的纪念节日，又译「和平纪念日」、「阵亡将士纪念日」。第一个国殇日于1919年在整个英联邦举行，原称「停战日」（Armistice Day），于1919年11月7日由英王乔治五世创立，纪念第一次世界大战于1918年11月11日上午11时结束。不同的地方对节日有着不同的称呼：国殇纪念日流行于澳洲、加拿大与英国；虞美人花日（Poppy Day）通用于马尔他和南非；退伍军人日（Veterans Day）为美国人的称呼；日本人将德文「Volkstrauertag」翻译为国民哀悼日（日语：国民哀悼の日），专指德国的国殇纪念日；在法国、新西兰以及其他英联邦国家则称为停战日（Armistice Day），这也是此节日本来的名称，为国际通用。

Remembrance Day (sometimes known as Poppy Day) is a memorial day observed in Commonwealth of Nations member states since the end of the First World War to remember the members of their armed forces who have died in the line of duty. Following a tradition inaugurated by King George V in 1919, the day is also marked by war remembrances in many non-Commonwealth countries. Remembrance Day is observed on 11 November in most countries to recall the end of hostilities of World War I on that date in 1918. Hostilities formally ended "at the 11th hour of the 11th day of the 11th month", in accordance with the armistice signed by representatives of Germany and the Entente between 5:12 and 5:20 that morning. ("At the 11th hour" refers to the passing of the 11th hour, or 11:00 am.) The First World War officially ended with the signing of the Treaty of Versailles on 28 June 1919.