LOL（也写作lol）是常见的网络语言用语，最初在Usenet上流行，及后在其他电脑辅助沟通工具中广泛使用，甚至在其他媒体也有使用。「LOL」是首字母缩略字，指laughing out loud或laugh out loudly，意即大声地笑。「LOL」是众多以文本代表笑的缩略语之一，其他有「ROTFL」（代表「roll(ing) on the floor laughing」，即笑到在地上翻滚）和「BWL」（代表「bursting with laughter」，意即爆发出笑声）。另外，LOL也有其他与笑无关的含意，但较为少用，如「lots of luck」（满载幸运）或「lots of love」（满载爱）。

LOL or lol, an acronym for laugh(ing) out loud, or lots of laughs, is a popular element of Internet slang. It was first used almost exclusively on Usenet, but has since become widespread in other forms of computer-mediated communication and even face-to-face communication. It is one of many initialisms for expressing bodily reactions, in particular laughter, as text, including initialisms for more emphatic expressions of laughter such as LMAO ("laugh(ing) my ass off") and ROFL (or its older form ROTFL; "roll(ing) on the floor laughing"). Other unrelated expansions include the now mostly obsolete "lots of luck" or "lots of love" used in letter-writing.