In the military, it can refer to certain non-commissioned members:

• Chief Petty Officer
• Chief Warrant Officer

In business, it can refer to any of numerous corporate titles, including:

• Chief executive officer
• Chief operating officer
• Chief information officer
• Chief technical officer
• Chief accounting officer
• Chief administrative officer
• Chief analytics officer
• Chief channel officer
• Chief compliance officer
• Chief communications officer
• Chief Customer Officer
• Chief data officer
• Chief financial officer
• Chief governance officer
• Chief information security officer
• Chief knowledge officer
• Chief learning officer
• Chief legal officer
• Chief marketing officer
• Chief networking officer
• Chief process officer
• Chief procurement officer
• Chief risk officer
• Chief science officer
• Chief strategy officer
• Chief sustainability officer
• Chief visionary officer

In education:

• Chief Academic Officer
• Chief Advancement Officer
• Chief Business Officer

In government:

• Chief Dental Officer
• Chief District Officer
• Chief Electoral Officer
• Chief Fire Officer
• Chief Firearms Officer
• Chief Medical Officer
• Chief police officer
• Chief Veterinary Officer