蜻蜓（英语：Dragonfly），是一种属于蜻蛉目的昆虫，于春天到秋天时出现，有细长翅膀与腹部。

蜻蜓，又称灯烃、负劳、蟌、蝍蛉、桑蜋、蜻虰、纱羊、青娘子、寻塘，尾庵，是属于蜻蛉目差翅亚目的昆虫。它的特征包括硕大的复眼，两对强而有力的透明翅膀，以及修长的腹部，长约8厘米。

蜻蜓一般捕食蚊子、摇蚊和其他小昆虫, 例如苍蝇、蜜蜂、蝴蝶等，部分甚至捕食鱼类。常雌雄成群，在水边飞行，交尾后，雌虫产卵于水草中。

蜻蜓通常在稚虫（水虿）栖息的湖泊、池塘、溪流或湿地附近活动。由于它们猎食害虫, 故此被视为重要的捕猎者。 《日华子本草》说：“蜻蜓，凉，无毒。”“入药去翅足，炒用良”，《别录》：“强阴止精。”《陆川本草》：“治肾虚阳萎。”为四川名菜。

A dragonfly is an insect belonging to the order Odonata, suborder Anisoptera (from Greek ανισος anisos "uneven" + πτερος pteros, "wings", because the hindwing is broader than the forewing). Adult dragonflies are characterized by large multifaceted eyes, two pairs of strong transparent wings, sometimes with coloured patches and an elongated body. Dragonflies can be mistaken for the related group, damselflies (Zygoptera), which are similar in structure, though usually lighter in build; however, the wings of most dragonflies are held flat and away from the body, while damselflies hold the wings folded at rest, along or above the abdomen. Dragonflies are agile fliers, while damselflies have a weaker, fluttery flight. Many dragonflies have brilliant iridescent or metallic colours produced by structural coloration, making them conspicuous in flight. An adult dragonfly eye has nearly 24,000 ommatidia.