子弹时间（英语：Bullet time）是一种使用在电影、电视广告或电脑游戏中，用计算机辅助的摄影技术模拟变速特效，例如强化的慢镜头、时间静止等效果。它的特点是不但在时间上极端变化（观众可以看到一些在平常不能见到的景象，如子弹飞过头顶，因此得名），而且在空间上极端变化：在慢镜头的同时拍摄角度（观众视角）也围绕场景旋转。

有些这种效果是传统摄影技术达不到的，例如在极短时间内摄影机的空间变化中，其不能以如此高的速度运动。也就是说只有虚拟的摄影机（通常用计算机模拟），在一个计算机生成的环境，例如虚拟现实或者电脑游戏中才可能“拍摄”出子弹时间的效果。在技术上历史上这种技术发展出不同的应用，例如时间分割（time slicing）、视角变换（view morphing）、超慢镜头（slow motion）、暂时死亡（temps mort）和虚拟摄影术（virtual cinematography）等。

Bullet time (also known as adrenaline time, focus time, frozen time, the big freeze, dead time, flow motion, slowing-your-roll, "Dead-Eye" or time slice) is a visual effect or visual impression of detaching the time and space of a camera (or viewer) from that of its visible subject. It is a depth enhanced simulation of variable-speed action and performance found in films, broadcast advertisements, and realtime graphics within video games and other special media. It is characterized both by its extreme transformation of time (slow enough to show normally impe****tible and unfilmable events, such as flying bullets) and space (by way of the ability of the camera angle—the audience's point-of-view—to move around the scene at a normal speed while events are slowed). This is almost impossible with conventional slow-motion, as the physical camera would have to move impossibly fast; the concept implies that only a "virtual camera", often illustrated within the confines of a computer-generated environment such as a virtual world or virtual reality, would be capable of "filming" bullet-time types of moments. Technical and historical variations of this effect have been referred to as time slicing, view morphing, temps mort, and virtual cinematography.