isometric may mean:

• Isometric projection (or “isometric perspective”), a method for the visual representation of three-dimensional objects in two dimensions; a form of orthographic projection, or more specifically, an axonometric projection.
• Isometric exercise, a form of resistance exercise in which one's muscles are used in opposition with other muscle groups, to increase strength, for bodybuilding, physical fitness, or strength training.
• Isometre, a rhythmic technique in music. See also: homorhythm.
• Isometric joystick, a computer input option.
• Isometric process, a thermodynamic process at constant volume (also isovolumetric)
• Isometry, a mathematical distance-preserving function, like congruence in geometry.
• Isometric crystal system, also called cubic crystal system.