Chief

Chief was a common designation for leading officers and enlisted people aboard Federation starships and installations. When used as a title referring to an officer it denoted positional authority, or department head status. In reference to an enlisted person, it referred directly to rank, specifically to the rank of chief petty officer or above.

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Starfleet ranks and titles

• Chief engineer, head of the engineering department on a starship
  • Assistant chief engineer, second-in-command of the engineering department on a starship
• Chief medical officer, head of the medical department on a starship
• Chief of operations, head of the operations on a starbase or space station
• Chief petty officer, rank given to senior non-commissioned officers, who have substantial experience and are considered experts in their specific profession.
  • Senior chief petty officer, a rank superior to chief petty officers and subordinate to master chief petty officers.
  • Master chief petty officer, highest enlisted rank, often given a great amount of responsibility and leadership roles, while subordinate to commissioned officers.
• Chief tactical officer, in charge of Tactical stations on a starship
• Commander in chief, in charge of Starfleet
  • Chief of staff, in charge of Starfleet personnel
  • Chief of Starfleet Intelligence, in charge of Starfleet Intelligence
  • Chief of Starfleet Operations, in charge of Starfleet Operations
• Transporter chief, in charge of transporter operation on a starship
• Security chief, in charge of security on a starship or at a Starfleet facility

Furthermore the script of Star Trek mentioned the function of station chief.

Other cultures

• Chief Archon, a Cardassian judge
• Chief financial officer, a senior position in the Ferengi Alliance

This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.