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All nineteen UCI WorldTeams and five UCI ProTeams participated in the race. Of these twenty-four teams, only Team Qhubeka Assos, with six riders, did not field the maximum allowed of seven riders. From the 165 riders who started the race, 103 finished.
On stage 2, Jonas Vingegaard, who was third in the points classification, wore the green jersey, because first-placed Primož Roglič wore the yellow jersey as the leader of the general classification, and second-placed Brandon McNulty wore the blue jersey as the leader of the young rider classification.
On stage 3, Alex Aranburu, who was second in the points classification, wore the green jersey, because first-placed Primož Roglič wore the yellow jersey as the leader of the general classification.
On stage 4, Alex Aranburu, who was third in the points classification, wore the green jersey, because first-placed Primož Roglič wore the yellow jersey as the leader of the general classification, and second-placed Tadej Pogačar wore the polka-dot jersey as the leader of the mountains classification.
On stage 4, Brandon McNulty, who was second in the young rider classification, wore the blue jersey, because first-placed Tadej Pogačar wore the polka-dot jersey as the leader of the mountains classification.
On stages 5 and 6, Jonas Vingegaard, who was second in the young rider classification, wore the blue jersey, because first-placed Brandon McNulty wore the yellow jersey as the leader of the general classification.
Final classification standings
Legend
Denotes the winner of the general classification
Denotes the winner of the Basque rider classification
Denotes the winner of the points classification
Denotes the winner of the team classification
Denotes the winner of the mountains classification
Denotes the winner of the combativity award
Denotes the winner of the young rider classification
Libro de Ruta Itzulia 2021 [2021 Itzulia Road Book] (PDF) (in Spanish). Organizaciones Ciclistas Euskadi. 2021. Archived from the original (PDF) on 26 March 2021. Retrieved 5 April 2021. {{cite book}}: |work= ignored (help)
Primož Roglič (SLO)
Alex Aranburu (ESP)
Mikkel Frølich Honoré (DEN)
David Gaudu (FRA)
Adam Yates (GBR)
Esteban Chaves (COL)
Brandon McNulty (USA)
Antwan Tolhoek (NED) 
Quinten Hermans (BEL)
Patrick Bevin (NZL)
Ben O'Connor (AUS)
Gino Mäder (SUI)
Eddie Dunbar (IRL)