A plane hologram is a hologram when the angle difference between the object beam and reference beam is less than 90 degrees. Plane means that the holographic information is primarily contained in the two-dimensional plane of the emulsion. Plane hologram is a type of transmission hologram.

Plane holograms are also called thin holograms which requires coherent or highly filtered playback source. The emulsion have a thickness of around seven microns or 7/millionths of a meter. The spacing between fringes is large enough, when the angle is under 90 degrees, for us to imagine that the depth of the emulsion isn't really being utilized in the recording of the hologram.

The image plane can be set in a way that the object seems to be optically suspending in front of the hologram, or just a part of it in front of the hologram and another part behind it, or that everything is suspending in the back. In a plane transmission hologram the reference beam is hitting the film from the same side as the object beam. It has a relatively uniform fringe pattern.

Plane hologram is widely used in electronic packaging.