The 2025 season is Clube de Regatas do Flamengo's 130th year of existence, their 114th football season, and their 55th in the Campeonato Brasileiro Série A, having never been relegated from the top division. In addition to the 2025 Campeonato Brasileiro Série A, Flamengo also compete in the 2025 Supercopa do Brasil, 2025 FIFA Club World Cup, 2025 CONMEBOL Copa Libertadores, the 2025 Copa do Brasil, and the 2025 Campeonato Carioca, the top tier of Rio de Janeiro's state football.
Kits.
Supplier: Adidas 
Sponsors: FlaBet (Main sponsor) / PixBet (Back of the shirt) / Assist Card (Lower back) / Banco BRB (Shoulder) / Shopee (Sleeves) / Texaco (Numbers) / ABC da Construção (Shorts) / Zé Delivery (Socks)
Competitions.
Pre-Season friendlies.
"Goals, assists and red cards are shown."
Supercopa do Brasil.
Flamengo qualified for the 2025 Supercopa do Brasil by winning the 2024 Copa do Brasil.
"Goals, assists and red cards are shown."
Campeonato Carioca.
Taça Guanabara table.
<onlyinclude>
</onlyinclude>
Matches.
"Goals, assists and red cards are shown."
Copa Libertadores.
The draw for the group stage will be held on 17 March 2025 on the CONMEBOL headquarters in Luque, Paraguay.
Matches.
"Goals, assists and red cards are shown."
Round of 16.
The draw for the round of 16 was held on 2 June 2025. 
"Goals, assists and red cards are shown."
Campeonato Brasileiro.
Matches.
"Goals, assists and red cards are shown."
Copa do Brasil.
Third round.
"Goals, assists and red cards are shown."
Round of 16.
The draw for the round of 16 was held on 2 June 2025. 
"Goals, assists and red cards are shown."
FIFA Club World Cup.
The draw was held on 5 December 2024.
Originally León was set to participate in the tournament as winner of the 2023 CONCACAF Champions League. On 21 March 2025, the team was removed from the tournament due to violating the FIFA Appeal Committee's rules on multi-club ownership, as León and Pachuca have the same owner. They were replaced with Los Angeles FC or Club América. On 31 May 2025 Los Angeles FC beat Club América 2–1 in extra time to claim the final tournament spot.
Matches.
"Goals, assists and red cards are shown."
Matches.
"Goals, assists and red cards are shown."
Roster.
List of currently full members of the professional team, youth players are also often used. Ages on 31 December 2025.
Statistics.
Appearances.
Players in "italics" have left the club before the end of the season.
<br>
† Denotes two way player, youth and professional team.
Penalty kicks.
Includes only penalty kicks taken during matches.
Penalty kick saves.
Includes only penalty kicks saves during matches. 
National Team statistics.
Appearances and goals while playing for Flamengo, includes only FIFA matches.
Attendance.
Includes all competition home matches in the 2024 season. Attendances recorded represent actual gate attendance, not paid attendance.