Mickey Mantle has hit the most career homers in the World Series, with 18 home runs.

who has hit the most home runs in the world series
MantleRuthBerraSniderJacksonGehrigRobinsonSkowronDiMaggioSpringerUtleyMcDougaldBauerGoslinDykstraSmithMarisSimmonsPedersonBregmanWilliamsBenchHoward18151211101088877777666655555
NAMESERIESGHRABRH2B3BRBISHSFSBCSBBIBBHBPSOGIDPPATBXBHAVGOBPSLGOPS
Mickey MantleMickey MantleWorld Series6518230425962400034436054227312326.257.374.535.908
Babe RuthBabe RuthWorld Series41151293742523324333223031669622.326.470.7441.214
Yogi BerraYogi BerraWorld Series75122594171100390102326317529511722.274.359.452.811
Duke SniderDuke SniderWorld Series361113321388026111013413321497919.286.351.594.945
Reggie JacksonReggie JacksonWorld Series27109821357124001015232431167418.357.457.7551.212
Lou GehrigLou GehrigWorld Series34101193043833510126221711488721.361.483.7311.214
Frank RobinsonFrank RobinsonWorld Series2689219232114000011132311065111.250.349.554.903
Bill SkowronBill SkowronWorld Series3981331939412901006112651416913.293.326.519.845
Joe DiMaggioJoe DiMaggioWorld Series5181992754603010019612372208414.271.338.422.760
George SpringerGeorge SpringerWorld Series147561419701100201210130684714.339.456.8391.295
Chase UtleyChase UtleyWorld Series157451391012004092211256318.200.357.6891.046
Gil McDougaldGil McDougaldWorld Series53719023454124222120112922157212.237.310.379.689
Hank BauerHank BauerWorld Series5371882146232420128012531997512.245.279.399.678
Goose GoslinGoose GoslinWorld Series3271291637501920312401401436312.287.348.488.836
Lenny DykstraLenny DykstraWorld Series1365013161011204091011061357.320.424.7001.124
Reggie SmithReggie SmithWorld Series2167313182013000380012381388.247.321.521.842
Roger MarisRoger MarisWorld Series41615226335018010018102131715611.217.298.368.667
Al SimmonsAl SimmonsWorld Series196731524601700061092794812.329.380.6581.037
Joc PedersonJoc PedersonWorld Series17540911209000041015044287.275.341.7001.041
Alex BregmanAlex BregmanWorld Series14559913101301104009164296.220.266.492.757
Bernie WilliamsBernie WilliamsWorld Series3251201625301401202070263141438.208.319.358.677
Johnny BenchJohnny BenchWorld Series23586162441140020830122944510.279.340.523.864
Elston HowardElston HowardWorld Series54517125427119301012533761896613.246.306.386.692
Billy MartinBilly MartinWorld Series285991533231900155111541055610.333.371.566.937
Gil HodgesGil HodgesWorld Series3951311535212121111710224151548.267.349.412.761
StatMuse has game-level data for home runs going back to the 1903 playoffs.
Some of the information used here was obtained free of charge from Retrosheet.