Liaison may be:

• Liaison (linguistics), the pronunciation of a written-word-final consonant due to a following vowel sound
• Liaison job, a job that links two or more specialties
• Liaison aircraft, a small aircraft used by military forces
• Liaison pilot, a World War II pilot who flew liaison aircraft

Liaison may also be:

• Affair
• Air Alliance, a Canadian airline whose call sign was "Liaison"

French loanwords