Since 2000, the Boston Red Sox have the most series wins by a team in the World Series, with 4 wins.

which team has won the most world series since 2000
Red SoxGiantsCardinalsYankeesNationalsDodgersCubsRoyalsPhilliesWhite SoxAstrosMarlinsAngelsDiamondbacks43221111111111
TEAMSERIESGSERIES WW%WLABRH2B3BHRRBISHSFSBCSBBIBBHBPSOGIDPPATBXBHAVGOBPSLGOPS
Boston Red SoxBoston Red SoxWorld Series194.842163662108169453191074552851381521476427767.255.345.418.763
San Francisco GiantsSan Francisco GiantsWorld Series233.6521587741192063352711588104731151851186833065.266.330.426.757
St. Louis CardinalsSt. Louis CardinalsWorld Series222.455101271586161362147114554891781561583124352.225.316.340.656
New York YankeesNew York YankeesWorld Series242.54213118138619236422835785819132081791930262.236.313.371.684
Washington NationalsWashington NationalsWorld Series71.5714324133588111323040271161527210120.241.320.419.739
Los Angeles DodgersLos Angeles DodgersWorld Series181.44481062182132252287624646349182769924555.213.293.395.687
Chicago CubsChicago CubsWorld Series71.571432452761102827028122336442729920.249.316.404.720
Kansas City RoyalsKansas City RoyalsWorld Series121.583754265410427155234812843801146414833.244.293.347.640
Philadelphia PhilliesPhiladelphia PhilliesWorld Series111.545653625188211205022121537388642217142.243.343.472.815
Chicago White SoxChicago White SoxWorld Series411.00040154204492620205115233051747517.286.360.487.847
Houston AstrosHouston AstrosWorld Series181.38971163778153331297673142661271411572027563.240.317.432.749
Florida MarlinsFlorida MarlinsWorld Series61.66742203174780217522314214842256110.232.282.300.582
Anaheim AngelsAnaheim AngelsWorld Series71.5714324541761517382360235238627511423.310.370.465.835
Arizona DiamondbacksArizona DiamondbacksWorld Series71.571432463765140636522217667052769720.264.325.394.719
Some of the information used here was obtained free of charge from Retrosheet.