Mr C B (Japanese : ミスターシービー, April 7, 1980 - December 15, 2000) was a Japanese Thoroughbred racehorse. He won the Japanese Triple Crown in 1983. He died of old age in 2000.

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Mr C B was a bay horse bred in Japan by Chigira Bokujo. He was sired by Tosho Boy, a son of Tesco Boy, out of C.B. Queen, a daughter of Topyo.

Major Racing Wins

• 1983 Yayoi Sho, Nakayama Turf 1800m
• 1983 Satsuki Sho (Japanese 2000 Guineas), Nakayama Turf 2000m
• 1983 Tokyo Yushun (Japanese Derby), Tokyo Turf 2400m
• 1983 Kikuka Sho (Japanese St. Leger), Kyoto Turf 3000m
• 1984 Tenno Sho (autumn) (Domestic GI), Tokyo Turf 2000m

Mr C B was named Japanese Horse of the Year for 1983 and was later inducted into the Japan Racing Association Hall of Fame in 1986.

• St Lite (Japanese first Triple crown in 1941)
• Shinzan (Japanese Triple crown in 1964)
• Symboli Rudolf (Japanese first undefeated Triple crown in 1984)
• Narita Brian (Japanese Triple crown in 1994)
• Deep Impact (Japanese Triple crown in 2005)
• Orfevre (Japanese Triple crown in 2011)
• Contrail (Japanese Triple crown in 2020)