CTB may refer to: Catch the Beat, an alternative game mode in Dean "peppy" Herbert's osu! Rhythm Game CTB/McGraw-Hill, a division of the McGraw-Hill Companies California Testing Bureau, a division of the McGraw-Hill Companies Cement-treated Base, a specific type of soil cement, used as a base Ceylon Transport Board, the nationalised passenger transport venture in Sri Lanka Christchurch Transport Board, a defunct municipal public transport operator in Christchurch, New Zealand Coding tree block, a processing unit of the High Efficiency Video Coding (HEVC) video standard Commonwealth of The Bahamas Comprehensive Test Ban - goal of the Comprehensive Test Ban Treaty Cooper Tire & Rubber Company's NYSE ticker symbol Ryan Giggs or CTB, the claimant in CTB v News Group Newspapers and CTB v. Twitter Inc., Persons Unknown Crabtree Technology Building, a Brigham Young University building Crash Thunder Buster, a finishing move of Jyushin Thunder Liger Cholera toxin B, a subunit of cholera toxin used for retrograde tracing Cut Bank Municipal Airport IATA code Citybus, a public bus operator in Hong Kong Catch the bus, internet slang for committing suicide Canadian Tire Bank, the retail deposit-taking and credit card-issuing arm of Canadian Tire Corporation, Limited .ctb, Color-dependent Plot Style Table, a file extension used by AutoCAD Coffee Table Book Consorcio de Transportes de Bizkaia, Biscay Transport Consortium