Five-person vocal group and unit in [[Umamusume]] originally debuting on April Fools' 2023 with a music video ([i]"Hat on Your Head!":[https://www.youtube.com/watch?v=BzRmdQioIQU][/i]) and a mock website listing the group's manifesto with personalized bios for each unit member as though they were a real-life music group.

BoC'z is a wordplay that can be read as "boushis" in Japanese (literally "The Hats"). Its members are all hat-wearing umamusume and consist of the following:

* [[Matikane Tannhauser (BoC'z) (Umamusume)|816-n]] ([[Matikane Tannhauser (Umamusume)|]]) 
* [[Rice Shower (BoC'z) (Umamusume)|ORYZA]] ([[Rice Shower (Umamusume)|]]) 
* [[Mr. C.B. (BoC'z) (Umamusume)|CAP.B]] ([[Mr. C.B. (Umamusume)|]]) 
* [[Hokko Tarumae (BoC'z) (Umamusume)|MACOtMai]] ([[Hokko Tarumae (Umamusume)|]]) 
* [[Cheval Grand (BoC'z) (Umamusume)|MARINE.C]] ([[Cheval Grand (Umamusume)|]]).

[tn](Pseudonyms are stylized as above with spaces and capitalization exactly as written.)[/tn]
BoC'z