The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions.
Aspect ratio may also refer to:
- Aspect ratio (aeronautics), the ratio of a wing's span to its mean chord
 - Aspect ratio (image), the proportional relationship between an image's width and its height
 - Display aspect ratio, the proportional relationship between a computer monitor's width and its height
 - Pixel aspect ratio, a mathematical ratio that describes how the width of a pixel in a digital image compares to the height of that pixel
 - Automotive engine aspect ratio, controlled by variable-geometry turbochargers
 
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