|Big Brother 21|
|Series Run||October 6th 2019-November 25th, 2019|
|Returnees|| Andria (BB22)|
|Previous Season||Big Brother 20|
|Next Season||Big Brother 22|
Big Brother 21, also known as Big Brother 21: Full Throttle, is the twenty first season of The Big Brother ORG Wiki.
|Tara (Host)||Val (Host)||Brandon (Host)||Morgan (Host)||Tyler (Producer)|
- Big Brother House: Houseguests are added to a Secret Facebook Group and Facebook Group Chat together with the hosts. This is where they are informed of events happening in the game. Events such as competitions, twists, etc. are posted in a forum in the Big Brother Wikia site.
- Head of Household
- Power of Veto
- Expulsion: Includes the "Three Strike Rule" for voting and challenge submissions.
- Jury: Consists of the final seven evicted houseguests.
- Fan Favorite Award
- Backwards Week: Week 1 will be played in reverse. The nominees will be chosen first, then the Power of Veto Competition, then the Head of Household Competition, and then the eviction.
- Roadkill Competition: A competition that the Houseguests can compete in to anonymously add a third nominee to the block.
- Returning Evicted Houseguest: In Week 5, the first 4 evicted houseguests competed in the HoH competition to try to win their way back into the game. Erin won and reentered the game, but she failed to become the new HoH.
- Viewing Lounge Juror: Due to a shortage on the jury, the Viewing Lounge acted as a seventh juror. The Viewing Lounge could ask their own questions to the finalists, and submitted their own voting form, with the most votes overall receiving the Lounge's one collective jury vote. The Viewing Lounge for Peter to win the game.
|Day 1||Day 10|| 15th|
|Day 1||Day 10|| 14th|
|Day 1||Day 14||13th||0||0||8||0|
|Day 1||Day 21||12th||0||0||6||0|
|Day 1||Day 28||11th||1||0||5||0|
|Day 1||Day 35|| 10th|
|Day 1||Day 42|| 9th|
|Day 1||Day 49|| 8th|
|Day 1||Day 7||7th|
|Day 29||Day 56|
|Day 1||Day 58|| 6th|
|Day 1||Day 63|| 5th|
|Day 1||Day 70|| 4th|
|Day 1||Day 77|| 3rd|
|Day 1||Day 78|| 2nd|
|Day 1||Day 78|| 1st|
|Head of Household||Johnny1||Sharon||Simon||Christina||Andria||Sharon||Christina||Sharon||Ashley||Andria||Ashley||None|
| Power of|
1 of 1
6 of 7
5 of 6
4 of 5
3 of 4
1 of 1
1 of 1
6 of 7
2 of 3
8 of 8
^1 In Week 1, the week was played in reverse. The nominees were chosen by the house, then the Diamond Power of Veto competition was played, followed by the Head of Household competition with everyone excluding the final nominees, and finally, the eviction by the HoH's sole vote.
^2 This person was nominated by the winner of the Roadkill competition.
^3 In Week 2, Amy and Johnny walked from the game for personal reasons. They both were not nominated at the time of their walks, so the week was not affected.
^4 In Week 5, the first four people evicted competed in the Head of Household competition. Out of them, the highest placing person returned to the game. They could also win HoH. Erin placed the best out of the four evictees, causing her to return to the game; however, she did not win HoH.
^5 In Week 6, Moe walked from the game for personal reasons. Since he was a final nominee, the eviction was cancelled and the next week began.
^6 In Week 10, due to Moe's walk from the game, his jury membership was given to the last evicted houseguest prior to the jury phase, JamiRose.
^7 In Week 9, Victoria received her third strike for not submitting for a competition and was removed from the game. Due to this, she was not a member of the jury.
^8 Due to Victoria's removal from the game, her jury vote was given to the Viewing Lounge. By a majority vote, they voted for Peter to win the game.
- Not counting Big Brother 20, this is the first season since Big Brother 5 that featured more females than males.
- Also excluding Big Brother 20, this is the first time that the jury is entirely comprised of female players.
- This is the first season where no non-American players reach the jury phase.