Through the 2008 season, that would be the Tampa Bay Buccaneers who lost 26 straight games starting September 12, 1976 (Game 1) and ending December 4, 1977 (Game 26). Those 26 games were the first 26 games in the Bucs' franchise history.
The most consecutive losses in Mets history is 24 in 1899 at the time the team was called the Spiders and was the begining of the expansion team
Kansas City/Sacramento Kings - 15 (1983-1997 seasons)
The team with the most losses in NFL history is the Tampa Bay Buccaneers.
The Vancover Grizzles lost 23 in a row in the 1996 NBA season. The worst start in NBA history goes to the 2009 New Jersey Nets who started off 0-17. The worst record in NBA history goes to the 1972-73 Philadelphia 76ers who finished 9-73. In the 2010-2011 season, the new record goes to the Cleveland Cavaliers with 25 consecutive losses in a row. ( 8-40) The most consecutive losses in NBA history.
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Mel Stottlemyre has the most losses in Yankees history with 139.
the new york knickerbockers, with 13
The Tampa Bay Buccaneers hold the title for being the NFL team with the most losses in history.
The record for the most consecutive games with a home run by a team in Major League Baseball history is 27 games, achieved by the 2019 New York Yankees.
Internazionale is the team in the Serie A that has the most number of consecutive wins.
The most consecutive home losses suffered by a team in the Canadian Football League was 14. The now defunct Ottawa Rough Riders had this dubious honour. Their losing streak stretched from July 19, 1987, to October 22, 1988.
The Boston Red Sox hold the record with 615 consecutive sellouts as of August 14, 2010.