Big Brother 2018 is the ninth season of the Big Brother Croatia and ninth season of Big Brother franchise overall to air on RTL. This season premiered on January 27, 2018 on RTL and lasted until the Superfinals on May 9, 2018. Antonija Blaće wast hosting the main shows.The prize for the winner this season is 371,000 kn. The winner of the season is Antonio Orac - Orky.

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On Day 1, 18 housemates entered the house. Dubravka, Marijan, Matija and Nikola V entered the Secret House. On Day 4, Zebo entered the house. On Day 17, Anči entered the house. On Day 20, Lidija and Ljiljana entered the house. On Day 31, Jure entered the house. On Day 36, 6 more housemates entered the house. On Day 47 Petar entered the house. On Day 50 Ante entered the house.

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After two years, Big Brother returned to the RTL program. The Big Brother house was rebuild in Jadran Film Studio and it is the biggest house ever. Preparations for the most famous reality show lasted from the beginning of October 2017, and 200 people worked on the project. The housemates enjoyed a space of 1150 square meters, and they had, among other things, a Jacuzzi in the living room. The house is equipped with 50 new 4k cameras that capture every step in a completely controlled environment. The only places where candidates will have privacy are the bathroom and the smoking area.