世纪末（法语：Fin de siècle）是指一个世纪的结束。世纪末不仅包括世纪之交的含意，又兼指一个时代的结束与开始，在19世纪末被认为是一段巨大转变，同时也蕴含希望的一个新时代。世纪末的“精神”，往往是指19世纪80年代和19世纪90年代的文化指标，包括犬儒主义、悲观主义。

世纪末普遍适用于法国艺术和艺术家，其运动影响许多欧洲国家。世纪末艺术家所提出的想法和顾虑引起象征主义和现代主义运动诞生。

世纪末的政治文化非常具有争议，对于法西斯主义产生重大影响。这个时代许多政治主张反抗唯物主义，理性主义，实证主义，资产阶级社会和自由主义民主。

Fin de siècle (French pronunciation: ​[fɛ̃ də sjɛkl]) is French for end of the century, a term which typically encompasses both the meaning of the similar English idiom turn of the century and also makes reference to the closing of one era and onset of a new era. The term is typically used to refer to the end of the 19th century. This period was widely thought to be a period of degeneration, but at the same time a period of hope for a new beginning. The "spirit" of fin de siècle often refers to the cultural hallmarks that were recognized as prominent in the 1880s and 1890s, including ennui, cynicism, pessimism, and "...a widespread belief that civilization leads to decadence."