渐变中灰滤镜（英语：Graduated Neutral Density Filter，简称中灰渐变镜或GND）是常用的物理滤镜中的一种。其作用为在大光比摄影（主要为风光摄影）时弥补相机感光组件（胶片或传感器）原生宽容度不足，使图像的暗部与高光部均合理曝光（详见亚当斯区域曝光法）。

在胶片时代，GND用于在风光摄影中尽可能还原肉眼所见美景；而到了数码摄影时代，初期传感器产品较小的动态范围可通过GND进行弥补，而数码暗房的出现也使得光比控制有了更多方法，如高动态范围成像（HDR）；但仍然有玩家认为物理GND相较于数字后制方法保留更多的细节，以及更少的噪点。

A graduated neutral-density filter, also known as a graduated ND filter, split neutral-density filter, or just a graduated filter, is an optical filter that has a variable light transmission. Typically half of the filter is of neutral density which transitions, either abruptly or gradually, into the other half which is clear. It is used to bring an overly-bright part of a scene into the dynamic range of film or sensor. For example, it can be used to darken a bright sky so that both the sky and subject can be properly exposed. ND filters can come in a variety of shapes and sizes and densities and can be used in all types of photographic applications from still photography, motion photography and scientific applications.