This is a list of the longest team losing streaks in Major League Baseball history. Streaks started at the end of one season are carried over into the following season. Two lists are provided—one with streaks that consist entirely of regular-season games and one with streaks of playoff games only. The longest losing streak by a defending World Series Champion is 11, by the 1998 Florida Marlins (now the Miami Marlins) and the 1986 Kansas City Royals.