2.5D may refer to:
- 2.5D, or 3/4 perspective and pseudo-3D, an attempt to render three-dimensional images in two dimensions.
- 2.5D (machining), technique used in machining to project a plane into a third dimension.
- 2.5D (visual perception), effect in visual perception where the 3D environment of the observer is projected onto the 2D planes of the retinas.
- A non-integer dimension in mathematics, see Hausdorff dimension.
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