Big Brother 4 was the fourth season of the reality show Big Brother in Bulgaria. It was aired on Nova Television and Nova+. The show launched on 22 September 2008 and continued for 3 months (12 weeks), ended on 14 December 2008, lasted for total of 84 days which is the shortest regular Big Brother season so far in Bulgaria.

The prize was 300,000 leva, which was the highest in the history of Big Brother Bulgaria. Milen Tsvetkov was the host of the show.

Former VIP Brother 2 housemate Veneta Raykova was the host of a new late-night talk-show called Little Sister. Rumen Lukanov was the host of the interactive part of the show.

The show was aired at 20:00 from Monday to Saturday. Weekly live shows are on Monday and Thursday. And after 22:30 on Sunday. Nova+ aired short live stream from the house at 10:00, 13:00, 16:00, 19:00 and 22:30. Replay episodes aired on Nova Television were broadcast at 18:00 the next day. The talk show Little Sister was aired on Monday and Thursday at 23:45.

Georgi Alurkov is the winner of this season.

Housemates From 22 June 2008 until 22 July 2008, auditions were held in the ten biggest cities in Bulgaria – Pleven, Veliko Tarnovo, Rousse, Shumen, Varna, Bourgas, Stara Zagora, Plovdiv, Blagoevgrad and Sofia. 13,955 candidates in total showed, 2,700 of which were in Sofia. The third and final round of the auditions was held in Sofia from 20 July 208 to 10 August 2008, with 415 candidates.

On 15 September 2008, ten of the selected housemates were isolated in separate secret places. Ten women entered the house on 22 September 2008. Originally, an eleventh housemate – Neli was expected to enter the house. However, she lost consciousness before entering the show and was decided not to take part. Instead, Violeta entered the show the next day.

Eleven men entered the house on Day 4. On Day 10, one of them – Tsvetan, was sent into the women's part of the house, and one of the women – Irena, into the men's.

Two new housemates – Ventsislav and Denislav, entered the house on Day 53. Denislav was chosen by the viewers, and Ventsislav – by the female housemates in the house.

Name Age Occupation Residence Day entered Day exited StatusGeorgi Georgiev Alurkov28GardenerSofia484Natalia Atanasova Mihaylova30Shop managerShumen184Daniela Georgieva Kostova28Sofia184Denislav Minev23BusinessmanShumen5384Tanya Kirilova Velkova 21 UnemployedAltimir 1 81 Samie Khyuseinova Dzheferova 56Nurse and supermarket cashier Ruse 1 78 Ventsislav Nikolov Daskalov 27MerchantPlovdiv 53 74 Ivanina Plamenova Koleva 21 StudentHaskovo 1 71 Martin Rusev Ivanov 24TailorHarmanli 4 67 Filip Shterev Ralev 31SSM mechanicSozopol 4 64 Violeta Peneva Peneva 28CroupierPlovdiv 2 60 Konstantin Antonov Mihaylov 32Dry construction workerVarna 12 57 Umberto Nave Dasilva 27CommercialParis, France 4 50 Jeni Kraycheva Chervenkova 47Sales managerShumen 1 50 Tsvetan Dimitrov Hristov 40Bodyguard, actorVarna 4 43 Ivan Iliev Gyumishev 58Trader and touristLom 4 39 Vladimir Stanislavov Ivanov 28Bank employeeDobrich 4 38 Kamen Nikolaev Tonov 22PeacekeeperPleven 4 37 Mila Zdravkova Petrova 35 Shumen 1 36 Emilia Alexieva Arabadzhieva 29Psychologist and sales coordinatorVeliko Turnovo 1 29 Irena Vasileva Ivanova 24Fashion agency ownerBurgas 1 22 Petar Ivanov Georgiev 23Assistant printerPlovdiv 4 22 Angelina Antonova Angelova 18 StudentPlovdiv 1 15Danail Kirilov Panchev 37ComedianSofia 4 8 Daniel Ankov Delchev 25 BuilderSliven 4 8 Neli Nikolaeva Hristova25UnemployedPlovdiv colspan="3"

Angelina Angelina Angelova is from Plovdiv. She entered the house on Day 1 and left voluntarily on Day 15, just a few minutes after moving into the house.

Danail Danail Panchev is from Sofia. He entered the house on Day 4 and was ejected on Day 8, after a fight with Daniel.

Daniel Daniel Delchev is from Sliven. He entered the house on Day 4 and was ejected on Day 8, after a fight with Danail.

Daniela Daniela Kostova is from Sofia. She entered the house on Day 1 and finished third in the finale on Day 84.

Denislav Denislav Minev is from Shumen. He entered the house on Day 53, after being chosen by the viewers. His girlfriend is the Bulgarian pop-folk singer Sonya Nemska, who was in the house for a few minutes during one of the housemates' week task. He finished fourth in the finale on Day 84.

Emilia Emilia Arabadzhieva is from Ruse. She entered the house on Day 1 and was the third evicted on Day 29.

Filip Filip Ralev from Sozopol entered the show on Day 4, posing as the mentally disabled man Toshko from Grudovo. When he entered the studio, the viewers and audience were not told about this, and they only learned the truth about Toshko when Big Brother called him in the Diary Room to confirm his secret mission: to fool all housemates into thinking he really has mental disabilities. He was the thirteenth evicted on Day 64.

Georgi Georgi Alurkov is from Sofia. He entered the house on Day 4 and became a winner on Day 84.

Irena Irena Ivanova is from Burgas. She entered the house on Day 1 and was the second evicted on Day 22.

Ivan Ivan Gyumishev is from Lom. He entered the house on Day 4 and was the seventh evicted on Day 39.

Ivanina Ivanina Koleva is from Haskovo. She entered the house on Day 1 and was the fifteenth evicted on Day 71.

Jeni Jeni Chervenkova is from Shumen. She entered the house on Day 1 and was the ninth evicted on Day 50.

Kamen Kamen Tonov is from Pleven. He entered the house on Day 4 and was the fifth evicted on Day 37.

Konstantin Konstantin Mihaylov is from Varna. He entered the show on Day 12 and was the first housemate to live in the new house. He was the eleventh evicted on Day 57.

Martin Martin Ivanov is from Harmanli. He entered the house on Day 4 and was the fourteenth evicted on Day 67.

Mila Mila Petrova is from Shumen. She entered the house on Day 1 and was the fourth evicted on Day 36. She was the first blind housemate in the history of Big Brother Bulgaria.

Natalia Natalia Mihaylova is from Shumen. She entered the house on Day 1 and finished second in the finale on Day 84.

Neli Neli Hristova is from Plovdiv. She was supposed to enter the house on Day 1, but she lost consciousness just before entering the show. The producers and the medical team decided that it was better not to take part in the show, and became a reserve. However, she entered the house on Day 81 for one night with all ex-housemates from the season.

Petar Petar Georgiev is from Plovdiv. He entered the house on Day 4 and was the first evicted on Day 22.

Samie Samie Dzheferova is from Ruse. She entered the house on Day 1 and was the seventeenth evicted on Day 78.

Tanya Tanya Velkova is from Altimir. She entered the house on Day 1 and was the eighteenth evicted on Day 81 after receiving the fewest positive votes from the viewers.

Tsvetan Tsvetan Hristov is from Varna. He entered the house on Day 4 and was the eighth evicted on Day 43.

Umberto Umberto Dasilva is from Paris. He entered the house on Day 4 and was the tenth evicted on Day 50.

Ventsislav Ventsislav Daskalov is from Plovdiv. He entered the house on Day 53, after he was chosen by the female housemates in the house. He was the sixteen evicted on Day 74.

Violeta Violeta Peneva is from Plovdiv. She entered the house on Day 2, replaced Neli. She was the twelfth evicted on Day 60.

Vladimir Vladimir Ivanov is from Dobrich. He entered the house on Day 4 and was the sixth evicted on Day 38.

Weekly summary and highlights Week 1 Twists Day 1 – 10 women entered the house. They were sent into the garden to live among an airplane's wrackage. Entrances Angelina, Daniela, Emilia, Irena, Ivanina, Jeni, Mila, Natalia, Samie and Tanya entered the house on Day 1. Violeta entered the house on Day 2. 11 men entered the house on Day 4 – Danail, Daniel, Filip, Georgi, Ivan, Kamen, Martin, Petar, Tsvetan, Umberto and Vladimir. The men and the women lived separated into two different airplane wrackages. Up for eviction The women nominated Irena and Jeni. They didn't know that viewers were voting which one of them to move into the men's place. Week 2 Up for eviction The men nominated Umberto and Kamen, Tsvetan was nominated by Big Brother. Viewers were voting which one of them to live with the women. Entrances Konstantin entered the house on Day 12. Exits Danail and Daniel were ejected on Day 8. Week 3 Up for eviction Irena, Umberto, Petar and Tsvetan Birthdays On 11 October Jeni celebrated her 48th birthday. There was a party in the house. Exits Angelina walked on Day 15, just a few minutes after moving into the house.

Nominations table The first housemate listed is nominated for two points, while the second housemate is nominated for one point. The two or more housemates with the most nomination points face the public vote to evict.

On Day 81 all ex-housemates from this season entered the house for one night, including Neli, who was supposed to enter the show on Day 1. Meanwhile, the current housemates moved to the airplane wreckage again.