Conjugation or conjugate may refer to:

  • Grammatical conjugation, the modification of a verb from its basic form
  • Conjugate (algebra), used to rationalize the denominator of a fraction
  • Conjugated systems of p-orbitals in chemical molecules
  • Conjugation (biochemistry), the turning of substances into a hydrophilic state in the body
  • Conjugation (acid-base theory), a system describing a conjugate acid-base pair
  • Conjugation (group theory), the image of an element under the conjugation homomorphisms
  • Conjugate (graph theory), an alternative term for a line graph