Big Brother 27 is the twenty-seventh season of the American reality television program Big Brother. The program is an adaptation of the franchise created in 1999 by John de Mol Jr. The season features a murder mystery hotel theme. It premiered on CBS on July 10, 2025, with filming beginning two days prior and running for 83 days, concluding on September 28, 2025.
Ashley Hollis won the season, defeating Vince Panaro by a jury vote of 6âÂÂ1. Keanu Soto was voted America's Favorite Houseguest with over 65% of the vote.
Big Brother follows a group of contestants, known as HouseGuests, who live inside a custom-built house outfitted with cameras and microphones that record them at all times. The HouseGuests are sequestered with no contact with the outside world. During their stay, the HouseGuests share their thoughts on their day-to-day lives inside the house in a private room known as the Diary Room. Each week, the HouseGuests compete to win power and safety inside the house. At the start of each week, the HouseGuests compete in a Head of Household (HOH) competition. The winner of the HOH competition is immune from eviction and selects two (or, in certain seasons, three) HouseGuests to be nominated for eviction.
Six HouseGuests are then selected to compete in the Power of Veto (POV) competition: the reigning HOH, the nominees, and other players selected by random draw. The winner of the POV competition has the right to either revoke the nomination of one of the nominated HouseGuests or to leave them as-is. If the POV winner uses this power, the HOH must immediately nominate another HouseGuest, other than the POV winner, for eviction.
On eviction night, the three nominated HouseGuests compete in the BB Block Buster competition to immediately get removed off the block. The two remaining HouseGuests face the house vote for possible eviction.
All HouseGuests vote to evict one of the nominees, though the HOH and the nominees are not allowed to vote. This vote is conducted in the privacy of the Diary Room. The nominee with the most votes is evicted from the house. In the event of a tie, the HOH casts the tie-breaking vote. The last seven evicted HouseGuests comprise the jury and are sequestered in a separate location following their eviction. The jury is only allowed to see the competitions and ceremonies that include all of the remaining HouseGuests; they are not shown any interviews or other footage that might include strategy or details regarding nominations. When there are only two remaining HouseGuests, the jury will vote for the season's winner, who receives a grand prize of $750,000. The viewing public awards an additional prize by choosing "America's Favorite HouseGuest", with the award being worth $50,000. All evicted HouseGuests are eligible to win this award except for those who either voluntarily leave or are forcibly removed for rule violations.
The initial cast of sixteen contestants was revealed on July 8, 2025. An additional seventeenth contestant was teased prior to the beginning of the season. During the premiere, this was revealed to be season 12 HouseGuest and season 13 winner Rachel Reilly. On December 25, 2025, former houseguest Mickey Lee died of cardiac arrest resulting from complications from the flu.
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On May 14, 2025, CBS announced that Big Brother 27 would premiere on July 10, 2025. Promos for the season suggested an overall theme related to secrets and mysteries, with television commercials featuring whispered conversations, and a promotional image of host Julie Chen Moonves posing with a wall of skeleton keys described as being able to "[unlock] unexpected mysteries in the Big Brother house". Filming began on July 8, 2025.
The theme for Big Brother 27 was ultimately revealed to be "A Summer of Mystery", with the house being re-themed as the "Hotel Mystère". The A.I. Arena twist from the previous season was revived as the "BB Block Buster"; as before, the HoH picks three nominees for eviction instead of two, with the three nominees then competing in a challenge for a chance to be saved from eviction.
The season premiered on CBS on July 10, 2025. Thereafter, new episodes are set to air on Sundays, Wednesdays, and Thursdays at 8:00 p.m. eastern time (ET), with Wednesday night episodes lasting 90 minutes long. A new companion showâÂÂBig Brother: UnlockedâÂÂwill air bi-weekly on Fridays beginning July 25; the show will feature additional footage and behind the scenes content, interviews, and guest analysis from alumni of past seasons.
Following their broadcast, new episodes stream on Paramount+ and CBS On Demand. As with previous seasons, Paramount+ is also providing access to 24/7 live feeds. The live feeds also stream on Pluto TV in a free advertisement-supported format.
In Week 9, a twist was introduced where an elimination by competition would be held rather than a traditional eviction cycle. The winner of the initial competition would start a chain reaction for the remaining players, and the person that did not complete the following competition in the allotted time would be eliminated. This led to the elimination of returning player Rachel Reilly, who had never been nominated for eviction prior to that week. The twist received backlash by some fans, commentators, and former alumni for breaking the core mechanics of the game. Some critics were also upset that the following Head of Household was determined by who completed the elimination competition the fastest before Reilly was eliminated.
While the competition had intervals for the players to strategize and campaign for who to pick for the next round, critics argued that even the concept of depending on a competition to avoid elimination was a fundamental betrayal of the Big Brother formula. It was also discussed how the twist tipped the scales too favorably for contestants that were better at competitions, and producers faced accusations of trying to emulate The Challenge instead.