This article shows all participating team squads at the 2021 Men's European Volleyball Championship, held in Poland, Czech Republic, Estonia and Finland from 1 to 19 September 2021.
<section begin=BEL /> The following is Belgium roster in the 2021 European Championship.
<section end=BEL />
<section begin=GRE /> The following is Greece roster in the 2021 European Championship.
<section end=GRE />
<section begin=POL /> The following is Poland roster in the 2021 European Championship.
<section end=POL />
<section begin=POR /> The following is Portugal roster in the 2021 European Championship.
<section end=POR />
<section begin=SRB /> The following is Serbia roster in the 2021 European Championship.
<section end=SRB />
<section begin=UKR /> The following is Ukraine roster in the 2021 European Championship.
<section end=UKR />
<section begin=BLR /> The following is Belarus roster in the 2021 European Championship.
<section end=BLR />
<section begin=BUL /> The following is Bulgaria roster in the 2021 European Championship.
<section end=BUL />
<section begin=CZE /> The following is Czech Republic roster in the 2021 European Championship.
<section end=CZE />
<section begin=ITA /> The following is Italy roster in the 2021 European Championship.
<section end=ITA />
<section begin=MNE /> The following is Montenegro roster in the 2021 European Championship.
<section end=MNE />
<section begin=SLO /> The following is Slovenia roster in the 2021 European Championship.
<section end=SLO />
<section begin=FIN /> The following is Finland roster in the 2021 European Championship.
<section end=FIN />
<section begin=NED /> The following is Netherlands roster in the 2021 European Championship.
<section end=NED />
<section begin=MKD /> The following is North Macedonia roster in the 2021 European Championship.
<section end=MKD />
<section begin=RUS /> The following is Russia roster in the 2021 European Championship.
<section end=RUS />
<section begin=ESP /> The following is Spain roster in the 2021 European Championship.
<section end=ESP />
<section begin=TUR /> The following is Turkey roster in the 2021 European Championship.
<section end=TUR />
<section begin=CRO /> The following is Croatia roster in the 2021 European Championship.
<section end=CRO />
<section begin=EST /> The following is Estonia roster in the 2021 European Championship.
<section end=EST />
<section begin=FRA /> The following is France roster in the 2021 European Championship.
<section end=FRA />
<section begin=GER /> The following is Germany roster in the 2021 European Championship.
<section end=GER />
<section begin=LAT /> The following is Latvia roster in the 2021 European Championship.
<section end=LAT />
<section begin=SVK /> The following is Slovakia roster in the 2021 European Championship.
<section end=SVK />