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| May 31 | ||
|---|---|---|
 ASTR | BEVZZZ, Draco, Frost, and Heroz join. | |
 TDP | Stirpeeh joins. | |
 SuperEvan & Biffle  Tommey & Almxnd in the HusKerrs Howl Top Dog Duos Day 3. | ||
| May 30 | ||
 SOM | Stirpeeh leaves. | |
 UYU | Proto joins. | |
 Espectro Esports  Empire Club in the CTW League 2021 Playoffs. | ||
| May 29 | ||
 EstR | Denz (Assistant Coach) joins. | |
| HolaPutoo MaulMagic in the UMG Gaming $1000 Prime 2v2 S&D 2021-05-29. | ||
| May 28 | ||
 TH | Conny (Coach) and Magxck (Coach) leave. | |
 LDN | Afro moves to starting roster. Zed moves to substitute. | |
 FLA | QueenShadows (Content Creator) joins. | |
 Jinete Esports  Rampage Esports in the Five Star Esports 2021 Season 1 Playoffs. | ||
| May 27 | ||
TRIBO | Team n4noFPS Team tiburci0 in the Tribo Series 2021. | |
 DOG$ | Soldier joins. Dirty leaves. | |
 UDOG$ | Soldier leaves. | |
 EvL | Carol (Coach) joins. | |
| May 26 | ||
 INF | Hawkz joins. | |
 SPAR | Hawkz leaves. | |
 Tribe Gaming  Zygnus Esports in the Mobile Mayhem Spring 2021 LA Playoffs. | ||
| Team EmZ Team Swish in the Women of the eRena V1sionaries. | ||
 NK | Organization ceases operations. Havok, iFlutz, Rafacreed, and Torturih leave. | |
| SUPR | Doty leaves. | |
| May 25 | ||
 ELV | JPDigits (Analyst) joins. | |
 HTM | Defrag, Joee, Nolson, Zer0, and camallenn (Analyst) join. | |
VWS | Trance & Revolt Reedr & Luvey in the Vikkstars Warzone Showdown II Community - Week 2. | |
| WarsZ & Skullface Dirty & Testyment in the Vikkstars Warzone Showdown II Creators - Week 2. | ||
 TRB | haxs, Jezz, Slothy, and Vague leave. | |
 Nova Esports  Tragik Esports in the Mobile Mayhem Spring 2021 EU Playoffs. | ||
| Tribe Gaming Zygnus Esports in the Mobile Mayhem Spring 2021 NA Playoffs. | ||
| Aydan & Rated Tommey & Almxnd in the HusKerrs Howl Top Dog Duos Day 2. | ||
| UYU | Yeez leaves. | |
 MV3 | Vikul joins. | |
 PAR | Zaptius joins. | |
 QUAD | Fifakill (Content Creator) joins. | |
| May 24 | ||
| EXES | Breszy, D3L1V3R, Depaa, Hosterz, and ATLAS (Coach) leave. | |
| Cheaters Unite Show Time in the Toronto Ultra 100K Canada Cup Qualifier 1. | ||
| ZLaner & Destroy Tommey & Almxnd in the HusKerrs Howl Top Dog Duos Day 1. | ||
| Call of Duty League Ruleset v1.5 is released. | ||
 LAT | TJHaLy moves to starting roster. Huke moves to substitute. | |
| Ferg Dr Disrespect in the Ferg vs Dr Disrepect 80's Throwdown. | ||
 SEA | Classic joins. | |
| PAR | Classic leaves. | |
| May 24 (approx.) | ||
 CAN | Davpadie, Royalty, and Xotic join. Diamondcon is loaned from NY Subliners. | |
 NY | Diamondcon is loaned to Team Canada. | |
 CHI | General returns from loan to Triumph. | |
 TRI | Mayhem, Xotic, and Willett (Head Coach) leave. General's loan from OpTic CHI ends. | |
| NY | Diamondcon joins as substitute from academy roster. | |
| NY.A | Roster disbands. Hamza, Prolute, Saints, and Denz (Coach) leave. Diamondcon leaves for main roster. | |
| May 23 | ||
| Tribe Gaming Zygnus Esports in the Trovo Titans Birthday Bash 2021 Finals. | ||
 Team Smog  Shady Kings Gold in the Esports Zone Sugar Land LAN 2021. | ||
 Shorys Gaming Team Smog in the Blink Battleground 2021 Midseason Event. | ||
| aBeZy Dashy in the CDL All-Star 1v1. | ||
 Team Eleventy  Trovo Mayhem in the Throwback Throwdown Invitational North America. | ||
 Team Chance  Team NAMELESS in the CDL All-Star Caster Draft 4v4. | ||
| TRB | Banned, Deci, Envy, and PerisH join. | |
| May 22 | ||
| TRB | Forsaken leaves. | |
 TB | Faded (Coach) joins. | |
Sobriety Gaming,  Trash Bros, N3MO, and The System qualify for Call of Duty Challengers 2021 Elite North America Stage 4. | ||
LOS PEPES, dfhsfgjfdj, The Originals, and  Team WaR qualify for Call of Duty Challengers 2021 Elite Europe Stage 4. | ||
Nova Esports  Meseeks in the Throwback Throwdown Invitational Europe. | ||
 NOVA | Team signs roster of  Team Elevate. BabaJaga, head4death, Marki, Ranvey, SaTuRnZz, Turu, and Yahya join. | |
 E8 | Roster is signed by Nova Esports. BabaJaga, head4death, Marki, Ranvey, SaTuRnZz, Turu, and Yahya leave. | |
| May 21 (approx.) | ||
 CR | VriZix joins. | |
| May 21 | ||
 3G | Aroma joins. BBConor leaves. | |
| TB | Jintroid rejoins. | |
| NY.A | Diamondcon joins from main roster. Spart leaves. | |
| NY | Diamondcon moves to academy roster. | |
| Team Tfue Team Repullze in the HusKerrs Howl Top Dog Trios. | ||
| MaulChewy kgfnjmsdfffser in the UMG Gaming $500 Prime 2v2 S&D 2021-05-21. | ||
| ORGL | Gismo joins. Joshh leaves. | |
| CDL All-Star Weekend Caster Draft 4v4 teams announced. | ||
| UYU | Emilia (Content Creator) joins. | |
 DAL | Vivid joins. | |
 LAG | Vivid leaves after loan to Trash Bros ends. | |
| TB | Vivid's loan from LA Guerrillas ends. | |
| Call of Duty League 2021 - Stage 4 schedule and groups announced. | ||
| May 20 (approx.) | ||
 AMLB | FeleXY, Sharhy, and Sysma leave. | |
| May 20 | ||
 STMN | Ghoul joins. | |
 SNG | Blends, Jeree, Marre, Napalz, Ragox, and Renzo join. | |
| Team MuTeX Team TeePee in the London Royal Ravens Operation MayDay. | ||
| AML | WarDy joins. | |
| UYU | Yeez joins. Wellyy leaves. | |
| DAL | FeLo moves to substitute. | |
| May 19 | ||
| NOVA | Banned, Deci, Envy, Luis, and PerisH leave. | |
| uTC | Slacked is loaned from FLA Mutineers. Methodz is loaned from TOR Ultra. Yeez leaves. | |
| FLA | Slacked is loaned to uT Crew. | |
| FLA | Slacked returns from loan to Fantastic Four. | |
 TOR | Methodz is loaned to uT Crew. | |
| TOR | Methodz returns from loan to Fantastic Four. | |
| F4 | Fire and Parasite leave. Slacked's loan from FLA Mutineers ends. Methodz's loan from TOR Ultra ends. | |
| HusKerrs & Newbz Swagg & Booya in the Nadeshot $100k Invitational. | ||
 Mav3ricks Gaming Club  Pushing Gaming in the NGL 2021 Dream Tournament 2. | ||
| $ 1,200,000 World Series of Warzone announced. | ||
| May 18 | ||
VWS | Ampz & JTG WoakZyN & TEXAZREXAZ in the Vikkstars Warzone Showdown II Community - Week 1. | |
| Lomba & JezuzJrr Vikkstar123 & Vapulear in the Vikkstars Warzone Showdown II Creators - Week 1. | ||
 Maycam Evolve  Royal Frog in the ArenaOn 2021 Season 2 4v4 Variant 3. | ||
| All-Star Weekend representatives announced. | ||
 XSET | SuperEvan (Content Creator) joins. | |
| SEA | Decemate leaves. | |
| LDN | Dominate (Coach) rejoins. Alexx moves to starting roster. Zaptius leaves. | |
| May 17 | ||
 TRU | TipWrath joins. | |
| E8 | head4death joins. | |
| CoD Zone renames to Esports Zone | ||
 MIN | MajorManiak moves to starting roster. Accuracy moves to substitute. | |
| MIN | MajorManiak returns from loan to uT Crew. | |
| uTC | MajorManiak's loan from MIN RØKKR ends. | |
| May 17 (approx.) | ||
| CR | FDzE leaves. | |
| May 16 | ||
 KING | Cobra, Melko, Nadox, and PraaX leave. | |
 PEPE | Abuzah and Traudey join. | |
| Arcitys is awarded the Call of Duty League 2021 - Stage 3 Player of the Stage. | ||
 Atlanta FaZe  New York Subliners in the Call of Duty League 2021 - Stage 3 Major. | ||
 VOID  Renegades in the Call of Duty Challengers 2021 Open #3 Asia Pacific. | ||
 Elevate ,,,,,,, in the Call of Duty Challengers 2021 Open #3 Europe. | ||
 EastR  Built by Gamers in the Call of Duty Challengers 2021 Open #3 North America. | ||
| May 15 (approx.) | ||
 ZYG | Awaken joins. | |
| May 15 | ||
| EXES | Breszy, D3L1V3R, Depaa, Hosterz, and ATLAS (Coach) join. | |
| E8 | Yahya joins. | |
| STMN | Yahya leaves. | |
 OVT | Natshay (Ambassador) joins. | |
 Killabyte Gaming  Jinete Gaming in the AfterDark eSports Miami Open 2021. | ||
| Bussed XYSTOSITY in the UMG Gaming Prime $1000 3v3 Search & Destroy 2021-05-15. | ||
 Shorys Gaming  Team Cruelty in the ACE Challenger League 2021 Open 1. | ||
| May 14 | ||
| F4 | Parasite joins. Jintroid leaves. | |
| AML | NukeJ leaves. | |
| May 13 | ||
| STMN | Yahya joins. head4death leaves. | |
| LDN | Team is sponsored by Midnite. | |
| May 12 | ||
 F/A | Staan retires. | |
| MV3 | Toro (Coach) leaves. | |
| May 11 | ||
 All Knights  Wild Esports in the Liga Movistar Pro Shot 2021 Playoffs. | ||
 Maycam Evolve  Royal Frog in the ArenaOn 2021 Season 2 4v4 Variant 2. | ||
| May 11 (approx.) | ||
 RBT | BooM leaves. | |
| May 10 (approx.) | ||
| 3G | BBConor joins. | |
| May 10 | ||
| TRU | Cyzu, Fusion, Gamer, Hihi, Solid, and Triton join. | |
 MOX | Blitz, Nostalgy, SkyLyon, and StaniuM leave. | |
| MV3 | Sikotik (Coach) joins. | |
| May 9 | ||
 Ottawa Uni. Black  Carleton University in the ABC x CCL Invitational 2021. | ||
 FAV Gaming qualifies for Japan Pro League 2021 Summer. | ||
| May 8 | ||
 DG Esports Revelation in the Garena Spring Minor Series 2021. | ||
| VoBowl Magic in the UMG Gaming $1000 Prime 2v2 S&D 2021-05-08. | ||
| EstR | MadCat (Assistant Coach) joins. Newb (Assistant Coach) leaves. | |
 SNKS | Ability, Combo, RA, and Staalk join. | |
| May 7 | ||
 WaR | YaKo joins. envdiaN (Player to Coach) changes position. | |
| May 6 | ||
| ​Future Majors will be four day events featuring Winners Bracket matches at the end of each day. | ||
| Stage 4 Major will take place on LAN without fans in attendence. | ||
| UYU | Faded (Coach) leaves. | |
| TH | Vikul leaves. | |
| MV3 | YaKo leaves. | |
| May 5 | ||
| EastR uT Crew in the Call of Duty Challengers 2021 Elite North America Stage 3 Playoffs. | ||
 Amelia Strays Elevate in the Call of Duty Challengers 2021 Elite Europe Stage 3 Playoffs. | ||
| $50,000 Mobile Masters announced for Europe and North America. | ||
| Call of Duty League 2021 All-Star Weekend is announced. Will take place May 22-23. | ||
| 3G | KidzZ leaves. | |
 ORG | Furiious, Grad, Hawqeh, and Rafi join. | |
 FR9x | Furiious, Grad, Hawqeh, Rafi, JayJay (Coach), and AlexGiry (Manager) leave. | |
| May 4 | ||
| Tommey & Almond Jukeyz & Fifakill in the Dallas Empire Jack Links Season 3 Invitational. | ||
| TB | Vivid is loaned from LA Guerrillas. | |
| LAG | Vivid is loaned to Trash Bros. | |
| LAT | Huke joins. | |
| DAL | Huke leaves. | |
| LAT | TJHaLy moves to substitute. | |
| TRI | Royalty leaves. | |
| ORGL | Pajson (Coach) joins. | |
| May 3 (approx.) | ||
| KING | PraaX joins. Lynz leaves. | |
 RVNS | Divvxll, Eleven, Jonny, and Snake leave. | |
| May 3 | ||
 UG | Beehzy, Charm, Mirage, Trajic, and Viiox (Coach) leave. | |
| F4 | Jintroid joins. | |
| TB | Jintroid leaves. | |
| SEA | Decemate joins. Loony moves to substitute. | |
| F4 | Decemate leaves. | |
 PSH | Torress leaves. | |
| May 2 | ||
| Noah & Citrus Tectonic & Kublai in the Duo Drop In Creator and Pro Invitational. | ||
| Subliners Academy EastR in the Call of Duty Challengers 2021 Cup #13 North America. | ||
| Team WaR Sneak2TheDome in the Call of Duty Challengers 2021 Cup #13 Europe. | ||
 Mindfreak Renegades in the Call of Duty Challengers 2021 Cup #13 Asia Pacific. | ||
SCL |  All Knights  4LF4 Team in the South Call of Duty League Liga Gold Playoffs. | |
| May 1 (approx.) | ||
 ZNSH | ExZ, Miney, Prizma, quique, vere, and Warvak join. | |
| INF | Pithon leaves. | |
| LDN | Dylan leaves. | |
 TM | Tectonic joins. | |
| NOVA | Tectonic leaves. | |
 MEC | Legendah joins. | |
| F4 | VinnY (Coach) leaves. | |
| May 1 | ||
| TRB | aflows and Cyzu leave. | |
| PEPE | Fussion and Torress join. | |
| TB | Hollow, Jintroid, Mock, and Ulisses join. | |
| KING | Melko rejoins. Staan leaves. | |
| CR | Melko and VriZix leave. | |
Shorys Gaming  The SoulKingz in the BroooTV Latam Invitational 2021. | ||
 HYA | Ability, Combo, RA, and Staalk leave. | |