Random Booster Vol. 21 (ランダムブースターVol.21, Randamubūsutā Vol. 21) is the twenty-first Random Booster released by Takara Tomy as part of the Beyblade Burst series. It was released in Japan on July 23rd, 2020 for 1100円.
Please note: One whole Beyblade is given in each individual booster. Unlike the previous 1/8 chance to get each Beyblade, there is now a 1/12 chance to get both Diabolos, 1/6 chance to get King Fafnir and Cosmo Pegasus, and 1/8 chance to get the remaining four Beyblades. Parts marked in bold are new to the series.
- B-170 01: Death Diabolos 4Turn Merge' 1D (Prize)
- B-170 02: Abyss Diabolos 5 Fusion' 1S (Prize)
- B-170 03: King Fafnir 8' Defense 1S
- B-170 04: Cosmo Pegasus 7 Atomic Sou
- B-170 05: Air Knight 10 Revolve
- B-170 06: Emperor Forneus Wheel Destroy
- B-170 07: Burn Phoenix 00 Assault'
- B-170 08: Dranzer Volcano 0 Charge'