'Raster' may refer to:
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Raster graphics, graphical techniques using arrays of pixel values
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Raster scan, the pattern of image readout, transmission, storage, and reconstruction in television and computer images
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Rasterisation, or rasterization, conversion of a vector image to a raster image
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Raster image processor, or RIP, a component of a printing system that performs rasterisation
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Raster to vector, an image conversion process
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Raster bar, an effect used in computer demos
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Raster-Noton, a record label
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Rastrum, a device used in medieval music manuscripts to draw staff lines