This article shows the rosters of all participating teams at the 2021 FIVB Volleyball Men's Club World Championship in Betim, Brazil.

The following is the roster of the Italian club Cucine Lube Civitanova in the 2021 FIVB Volleyball Men's Club World Championship.^[1]

No.	Name	Date of birth	Height	Position
1	Gabriel García Fernández	8 January 1999	2.00 m (6 ft 7 in)	opposite
2	Jiří Kovář	10 April 1989	2.02 m (6 ft 8 in)	outside hitter
3	Daniele Sottile	17 August 1979	1.86 m (6 ft 1 in)	setter
4	Andrea Marchisio	6 November 1990	1.86 m (6 ft 1 in)	libero
5	Osmany Juantorena	12 August 1985	2.00 m (6 ft 7 in)	outside hitter
6	Rok Jerončič	10 November 2001	2.07 m (6 ft 9 in)	middle blocker
7	Fabio Balaso	20 October 1995	1.78 m (5 ft 10 in)	libero
8	Ricardo Lucarelli	14 February 1992	1.96 m (6 ft 5 in)	outside hitter
9	Ivan Zaytsev	2 October 1988	2.04 m (6 ft 8 in)	opposite
12	Enrico Diamantini	4 April 1993	2.04 m (6 ft 8 in)	middle blocker
13	Robertlandy Simón	11 June 1987	2.08 m (6 ft 10 in)	middle blocker
15	Luciano De Cecco	2 June 1988	1.94 m (6 ft 4 in)	setter
17	Simone Anzani	24 February 1992	2.03 m (6 ft 8 in)	middle blocker
23	Marlon Yant	23 May 2001	2.04 m (6 ft 8 in)	outside hitter
Head coach:		Gianlorenzo Blengini

The following is the roster of the Iranian club Sirjan Foolad in the 2021 FIVB Volleyball Men's Club World Championship.^[2]

No.	Name	Date of birth	Height	Position
1	Sahand Allah Verdian	8 December 1995	1.99 m (6 ft 6 in)	middle blocker
2	Mahdi Jelveh Ghaziani	21 May 2001	2.08 m (6 ft 10 in)	middle blocker
3	Aleksandar Blagojevic	5 August 1993	1.97 m (6 ft 6 in)	opposite
5	Amir Hossein Derakhshan	2 August 1986	1.98 m (6 ft 6 in)	setter
6	Reza Abedini	19 May 1991	2.03 m (6 ft 8 in)	middle blocker
8	Rasoul Shahsavari Nejad	21 January 1993	1.82 m (6 ft 0 in)	libero
9	Ehsan Daneshdoust	1 January 2000	1.92 m (6 ft 4 in)	outside hitter
10	Mohammad Sadeghi Malati	28 August 1994	2.04 m (6 ft 8 in)	outside hitter
12	Mojtaba Gholizad	26 March 1990	1.96 m (6 ft 5 in)	outside hitter
13	Alireza Behbodi	10 March 1979	1.92 m (6 ft 4 in)	setter
14	Amirhossein Esfandiar	24 January 1999	2.09 m (6 ft 10 in)	outside hitter
18	Armin Tashakkori	8 December 1986	2.00 m (6 ft 7 in)	middle blocker
20	Mostafa Heydari	14 December 1991	1.75 m (5 ft 9 in)	libero
Head coach:		Saeid Rezaei

The following is the roster of the Brazilian club Funvic Natal in the 2021 FIVB Volleyball Men's Club World Championship.^[3]

No.	Name	Date of birth	Height	Position
1	Matheus Krauchuk	4 November 1997	1.97 m (6 ft 6 in)	opposite
6	Patrick Gasman	2 January 1997	2.08 m (6 ft 10 in)	middle blocker
7	Murilo Radke	31 January 1989	1.99 m (6 ft 6 in)	setter
8	André Ludegards	27 September 1999	1.86 m (6 ft 1 in)	outside hitter
10	Vitor Yudi	12 March 1999	1.85 m (6 ft 1 in)	libero
11	João Mossa	22 August 2000	1.90 m (6 ft 3 in)	setter
12	Gabriel Santos	18 May 1997	0.00 m (0 in)	opposite
13	Gabriel Garcia	25 May 1997	0.00 m (0 in)	setter
15	Riad Ribeiro	2 October 1981	2.04 m (6 ft 8 in)	middle blocker
16	Felipe Brito	1 October 1998	2.05 m (6 ft 9 in)	middle blocker
17	Thales Hoss	26 April 1989	1.90 m (6 ft 3 in)	libero
18	Felipe Roque	19 May 1997	2.05 m (6 ft 9 in)	opposite
19	Symon Lima	11 August 1996	0.00 m (0 in)	middle blocker
20	Fábio Rodrigues	26 July 1995	1.99 m (6 ft 6 in)	outside hitter
Head coach:		João Conceição

The following is the roster of the Brazilian club Sada Cruzeiro in the 2021 FIVB Volleyball Men's Club World Championship.^[4]

No.	Name	Date of birth	Height	Position
1	Welinton Oppenkoski	28 March 2000	1.98 m (6 ft 6 in)	opposite
3	Lucas de Deus	26 January 1987	1.78 m (5 ft 10 in)	libero
4	Otávio Pinto	27 February 1991	2.02 m (6 ft 8 in)	middle blocker
5	Lucas Lóh	18 January 1991	1.96 m (6 ft 5 in)	outside hitter
6	Guilherme Rech	5 January 2001	2.02 m (6 ft 8 in)	middle blocker
8	Wallace de Souza	26 June 1987	1.98 m (6 ft 6 in)	opposite
10	Cledenilson Souza	9 June 1998	2.10 m (6 ft 11 in)	middle blocker
11	Rodrigo Leão	5 June 1996	1.97 m (6 ft 6 in)	outside hitter
12	Isac Santos	13 December 1990	2.08 m (6 ft 10 in)	middle blocker
14	Fernando Kreling	13 June 1996	1.85 m (6 ft 1 in)	setter
16	Lucas Bauer	20 October 1999	1.92 m (6 ft 4 in)	libero
17	Rhendrick Rosa	11 February 1999	1.82 m (6 ft 0 in)	setter
18	Matias Provensi	26 March 2001	2.01 m (6 ft 7 in)	outside hitter
19	Miguel Ángel López	25 March 1997	1.90 m (6 ft 3 in)	outside hitter
Head coach:		Filipe Ferraz

The following is the roster of the Italian club Itas Trentino in the 2021 FIVB Volleyball Men's Club World Championship.^[5]

No.	Name	Date of birth	Height	Position
1	Matey Kaziyski	23 September 1984	2.03 m (6 ft 8 in)	outside hitter
3	Wout D'Heer	26 April 2001	2.03 m (6 ft 8 in)	middle blocker
5	Alessandro Michieletto	5 December 2001	2.05 m (6 ft 9 in)	outside hitter
6	Riccardo Sbertoli	23 May 1998	1.90 m (6 ft 3 in)	setter
7	Oreste Cavuto	5 December 1996	2.00 m (6 ft 7 in)	outside hitter
10	Giulio Pinali	2 April 1997	1.98 m (6 ft 6 in)	opposite
12	Daniele Albergati	21 June 1993	2.00 m (6 ft 7 in)	opposite
15	Daniele Lavia	4 November 1999	1.95 m (6 ft 5 in)	outside hitter
16	Julian Zenger	1 January 1997	1.90 m (6 ft 3 in)	libero
18	Marko Podraščanin	29 August 1987	2.03 m (6 ft 8 in)	middle blocker
20	Srećko Lisinac	17 May 1992	2.05 m (6 ft 9 in)	middle blocker
22	Lorenzo Sperotto	28 April 1999	1.90 m (6 ft 3 in)	setter
24	Carlo De Angelis	10 January 1996	1.90 m (6 ft 3 in)	libero
Head coach:		Angelo Lorenzetti

The following is the roster of the Argentine club UPCN San Juan in the 2021 FIVB Volleyball Men's Club World Championship.^[6]

No.	Name	Date of birth	Height	Position
1	Matías Olivieri	10 March 2002	1.90 m (6 ft 3 in)	middle blocker
2	Brian Melgarejo	28 March 1995	1.91 m (6 ft 3 in)	outside hitter
5	Lucas Ibazeta	19 September 2002	1.82 m (6 ft 0 in)	outside hitter
6	Mateo Bozikovich	6 March 1992	1.89 m (6 ft 2 in)	setter
7	Franco Cáceres	28 March 1994	2.00 m (6 ft 7 in)	opposite
9	Sebastián Brajkovic	10 February 1982	1.95 m (6 ft 5 in)	setter
11	Manuel Armoa	1 December 2002	1.95 m (6 ft 5 in)	outside hitter
14	Igor Gonçalves	4 January 1988	2.05 m (6 ft 9 in)	opposite
15	Agustín Gallardo	1 March 2001	1.95 m (6 ft 5 in)	middle blocker
16	Joan Jaraba	20 September 1997	2.01 m (6 ft 7 in)	middle blocker
17	Matías Salvo	25 January 1991	1.82 m (6 ft 0 in)	libero
18	Fabián Flores	25 May 1991	1.98 m (6 ft 6 in)	middle blocker
19	Jailton da Silva Junior	23 September 1993	2.03 m (6 ft 8 in)	outside hitter
20	Nicolás Perren	15 May 1995	1.63 m (5 ft 4 in)	libero
Head coach:		Fabián Armoa