|Big Brother Brazil 18|
|Series Run||January 22, 2018 - April 19, 2018|
|Prize Money||R$ 1.5 million|
|Runner(s)-up|| Kaysar Dadour|
Ana Clara & Aryton Lima
|Previous Series||Big Brother Brazil 17|
|Next Series||Big Brother Brazil 19|
Big Brother Brazil 18 is the eighteenth season of Big Brother Brazil.
The cast was revealed on January 18, 2018, one-by-one during commercial breaks on Rede Globo. Online, a round-table led by Big Brother Brazil 13 winner Fernanda Keulla to discuss the new housemates with past housemates. The new housemates would also be interviewed by Big Brother Brazil 17 runner-up Vivian Amorim in sequester as they would be revealed. These interviews were held live from the sequester hotel and also were shown online.
- Project DNA: In a modified version of the Project DNA twist, an entire family will move into the house on Day 1. The entire family consists of father Aryton, mother Eva, daughter Ana Clara and cousin Jorge Lima. However, the fans will vote for two members of the family to stay, thus evicting the other two family members.
- Two Contestants Play As One Houseguest: The two family members that were chosen to stay, Ana Clara & Aryton Lima, would compete in competitions every other week beginning with Ana Clara and would only get to share one vote.
- Power of Veto: Similarly to the American and Canadian versions of the game and to replace the Power of Immunity competition from previous seasons, the Power of Veto allows it’s holder to veto one of the nominees. However, there are differences such as:
- The Power of Veto competition is played before the nominations are made.
- The veto holder is not allowed to veto any nominees nominated prior to the nomination ceremony (such as nominated by a twist).
- The HOH is not allowed to play in this competition.
- Face to Face Nominations: During the Week 6 nominations, the housemates had to nominate their fellow housemates in front of everyone else as opposed to the usual private nominations held in the Diary Room.
- Fake Double Eviction: In Week 6, the Housemates were told that the two people with the "most votes" to evict would be eliminated. However, this was a cover up as the person who received the least amount of votes to evict will instead be transferred to a secret room where they will stay until the Friday of that week. This housemate will return with immunity and the power to nominate someone directly on the block.
|Week 1||Week 2||Week 3||Week 4||Week 5||Week 6||Week 7||Week 8||Week 9||Week 10||Week 11||Week 12|
|Day 1||Day 7||Day 74||Day 77||Day 84||Day 85||Finale|
|Gleici|| Ineligible||Diego||Ana Paula|| Saved|
|Viegas||Jessica|| Ineligible|| Ineligible||Winner|
|Kaysar|| Ineligible||Viegas||Viegas||Viegas||Lucas||Lucas (x2)||Gleici||Wagner||Wagner||Gleici|| Wagner|
|Ana Clara||Ineligible||Diego||Diego||Ana Paula||Nayara||Diego||Diego||Diego||Diego|
|Paula|| Ineligible||Patrícia||Ana Paula||Ana Paula||Diego||Caruso||Diego||Caruso||Caruso||Caruso||Viegas||Viegas|| Ana Clara|
|Paula|| Ana Clara|
|Breno|| Ineligible||Gleici||Caruso||Ana Paula||Gleici||Wagner||Wagner||Diego||Caruso||Kaysar|| Ana Clara|
|Jessica|| Ineligible|| Vetoed|
|Ana Paula||Gleici||Caruso||Gleici||Caruso||Caruso||Caruso|| Ana Clara|
|Viegas|| Ineligible||Jessica||Mahmoud||Mahmoud||Mahmoud||Jessica||Mahmoud|| Saved|
| Ana Clara|
| Ana Clara|
| Ana Clara|
|Wagner|| Ineligible||Jessica||Mahmoud||Mahmoud|| Saved|
|Caruso|| Ineligible||Jessica||Mahmoud||Mahmoud||Mahmoud||Jessica||Mahmoud||Jessica||Jessica||Gleici|| |
|Diego|| Ineligible||Jessica||Mahmoud||Paula||Gleici||Paula||Gleici||Breno|| Gleici|
|Patrícia|| Ineligible||Jessica||Mahmoud||Mahmoud||Gleici|| Saved|
|Mahmoud|| Ineligible|| Ana Paula|
|Ana Paula||Ana Paula||Caruso||Caruso||Wagner|| |
|Lucas|| Ineligible||Gleici||Gleici|| Ana Clara|
|Nayara|| Ineligible||Jessica||Mahmoud||Mahmoud||Caruso|| |
|Ana Paula|| Ineligible||Jessica||Mahmoud||Mahmoud|| |
|Jaqueline|| Ineligible||Gleici|| Ana Clara|
|Mara|| Ineligible||Caruso|| |
|Key:||HOH||Non-Immune HOH||Nominated||Immune||POV||POI||Twist Holder||Evicted|
|Saved: Saved by Immunity Winner(s)||Vetoed: Vetoed Post-Nominations||Face to Face Nominations|
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