The 2020–21 GNK Dinamo Zagreb season was the club's 110th season in existence and its 30th consecutive season in the top flight of Croatian football. In addition to the domestic league, Dinamo Zagreb participated in this season's editions of the Croatian Football Cup, the UEFA Champions League, and the UEFA Europa League. The season covered the period from 26 July 2020 to 30 June 2021.
 "As of 22 May 2021"
Transfers.
Loan out.
 Total Spending: €13,800,000
 Total Income: €30,450,000
 Net Income: €16,650,000
Pre-season and friendlies.
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Competitions.
Prva HNL.
Matches.
The league fixtures were announced on 29 July 2020.
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Croatian Football Cup.
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UEFA Champions League.
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UEFA Europa League.
Qualifying rounds.
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Group stage.
The group stage draw was held on 2 October 2020.
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Knockout phase.
Round of 32.
The draw for the round of 32 was held on 14 December 2020.
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Round of 16.
The draw for the round of 16 was held on 26 February 2021. The order of legs was reversed after the original draw to avoid a scheduling conflict with the Arsenal v Olympiacos second leg in the same city on 18 March, as Arsenal were the domestic cup winners and given higher priority over Tottenham.
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Quarter-finals.
The draw for the quarter-finals was held on 19 March 2021.
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 "As of 22 May 2021"
References.
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