微下击爆流（英文：Microburst），又称微爆流、微爆气流、微下冲气流，是一种局部性的下沉气流，气流到达地面后会产生一股与龙卷风破坏力相约的直线风（straight-line winds）向四方八面扩散。

微下击暴流是下击暴流的一种，气象学者籐田哲也把下爆气流分为微暴流和巨暴流（Macroburst），影响方圆4公里或以下的被界定为「微暴流」，影响方圆4公里以上则被界定为「巨暴流」。

微下击暴流能够产生时速超过270公里的风。

A microburst is a small downdraft that moves in a way opposite of a tornado. Microbursts are found in strong thunderstorms . Within a thunderstorm there are two types of microbursts: wet microbursts and dry microbursts. They go through three stages in their life cycle: the downburst, outburst, and cushion stages. Microbursts can be particularly dangerous to aircraft, especially during landing due to the wind shear caused by its gust front. Several fatal crashes having been attributed to the phenomenon over the past several decades, and great lengths go into properly training flight crews on how to recover from a microburst/wind shear event.