Worst is an ongoing serial manga written and illustrated by Hiroshi Takahashi. Originally published in Japan by Akita Shoten in the January 2002 issue of Shonen Champion Monthly Magazine, where new chapters continue to be released. In addition to its regular run in SCM, past chapters are concurrently reprinted and bound into collected volumes.

In addition to its native Japanese, Worst has also been printed in Korean, French and Thai languages. US distribution rights were secured by DMP Publishers in 2004, but to date only three volumes have been translated. At present, Worst has been put on hiatus by DMP and future English language volumes are uncertain.

Classified as a "delinquent" title in which action typically revolves around gangs and physical violence, Worst incorporates strong themes of integrity, loyalty, personal values and friendship while maintaining intense fighting sequences and engaging story lines. Characters are not your typical "thugs" and even bitter enemies are most often portrayed as honorable rivals.

Considered a spin off or sequel to Crows, a previous series by Takahashi, it is not required that newcomers initially introduced to Worst be familiar with past events, nor is reading Crows a prerequisite to its overall enjoyment. While knowledge of the Crows back-story would provide readers of Worst further insight into recurring characters and themes shared between the two series, the actual story arc in Worst is completely self contained and revolves mainly around a new cast.