CYTB may refer to:

• MT-CYB, a gene
• the ICAO code for Tillsonburg Airport in Ontario, Canada

• Chancellor of the Holy See
• Chancellor of the Kingdom of France
• Chancellor of the North German Confederation
• Chancellor of the order of the thistle
• Chancellor of the Realm
• Chancellor of the tang dynasty
• Chancellor of the University of Cape Town
• Chancellor of the university of edinburgh
• Chancellor of the university of glasgow
• Chancellor of the University of Glasgow
• Chancellor of the University of London
• Chancellor of the university of st andrews
• Chancellor of Trinity College, Dublin
• Chancellor of uppsala university
• Chancellor palpatine
• Chancellor Ridge
• Chancellor (Ritsuryō)
• Chancellors and Council Presidents of Aragon
• Chancellor Seguier
• Chancellorship of gordon brown
• Chancellor's Office
• Chancellors of the university of alberta
• Chancellors of the University of British Columbia
• Chancellors of the University of Exeter
• Chancellors of the University of New South Wales