相片马赛克（Photomosaic），或称蒙太奇照片、蒙太奇拼贴，是一种影像处理的艺术技巧，利用这个方式做出来的图片，近看时是由许多张小照片合在一起的，但远看时，每张照片透过光影和色彩的微调，组成了一张大图的基本像素，就叫做相片马赛克技巧。最先是由一个美国大学生发明的，但当时限于计算机性能，无法大量应用。目前这个技巧几乎全部是用电脑软件做成的，第一次大量出现可能是在电影海报《楚门的世界》（The Truman Show）当中。

Photomosaic目前已被Runaway Technology, Inc.注册为商标，所以英语中也常常改用「Photographic mosaic」来表示。

In the field of photographic imaging, a photographic mosaic, also known under the term Photomosaic, a portmanteau of photo and mosaic, is a picture (usually a photograph) that has been divided into (usually equal sized) tiled sections, each of which is replaced with another photograph that matches the target photo. When viewed at low magnifications, the individual pixels appear as the primary image, while close examination reveals that the image is in fact made up of many hundreds or thousands of smaller images. Most of the time they are a computer-created type of montage.