Principal

• Principal (academia), the chief executive of a university
  • Principal (education), the head of a school
• Principal (civil service) or principal officer, the senior management level in the UK Civil Service
• Principal dancer, the top rank in ballet
• Principal (music), the top rank in an orchestra

Law

• Principal (commercial law), the person who authorizes an agent
  • Principal (architecture), licensed professional(s) with ownership of the firm
• Principal (criminal law), the primary actor in a criminal offense
• Principal (Catholic Church), an honorific used in the See of Lisbon

• Principal, Cape Verde, a village
• Principal, Ecuador, a parish

• The Principal (TV series), a 2015 Australian drama series
• The Principal, a 1987 action film
• Principal (music), the lead musician in a section of an orchestra
• Principal photography, the first phase of movie production
• "Principal", a song by Cardi B featuring Janet Jackson from the album Am I the Drama?
• "The Principal", a song by Melanie Martinez from the album K-12
• The Principal (Vice Principals), an episode of the American TV series Vice Principals

• Principal (finance) or principal sum, the original amount of a debt or investment on which interest is calculated
  • Principal (bond), the face value of a bond
• Principal Financial Group, a life insurance company

• Principal (computer security), an entity that can be identified and verified
• Principal or diapason, one of the flue pipes on a pipe organ
  • Principal or diapason, a corresponding organ stop on a pipe organ
• Victoria Principal (born 1950), American actress