• Absolute value of a real or complex number
• Modulus (algebraic number theory), a formal product of places of a number field
• Modulus of continuity, a way to measure the smoothness of a function
• Young's modulus and other elastic moduli, a measure of stiffness
• Modulus Guitars, musical instrument manufacturer

• A villain in Marvel's Fantastic Four comic book series
• %, the modulo operator of various programming languages

See also

• Module
• Moduli
• Modulo