Question: has any team not won the world series

Answer: No, The Seattle Mariners and the Washington Nationals (formerly Montreal Expos) are the only current Major League Baseball franchises to have never appeared in a World Series; the San Diego Padres, Colorado Rockies, Texas Rangers (formerly the 1961--1971 version of the Washington Senators), Tampa Bay Rays, and Milwaukee Brewers (formerly Seattle Pilots) have all played in the Series but have never won. The Toronto Blue Jays are the only franchise from outside the United States to appear in a World Series, winning in 1992 and 1993. The Houston Astros have represented both the NL (2005) and the AL (2017), winning the Series in 2017. The current World Series champions are the Boston Red Sox.