Veliki brat 2015, also known as Veliki brat 5 (Big Brother 7 in Croatia) or simply VB5, is series of the Serbian, Croatian, Montenegrin, Bosnian-Herzegovian and Macedonian production of Big Brother series.

It is the fifth series of the show in Serbia and seventh in Croatia - for both a first series after the show went on a two-year hiatus. The series is broadcast by RTL Televizija for Croatia, B92 for Serbia, Televizija OBN and BN for Bosnia & Herzegovina, Sitel for Macedonia and Prva TV for Montenegro.

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The series was originally planned for fall 2013, but producers decided on canceling the series, and said that they would instead do one in early 2014. Later on, in spring 2014, they said they plan to push it to fall 2014, or even spring 2015. On October 12, 2014, it was announced that the series will not be aired, because the house was demolished. However, this news was fake, since Slovenia used that house earlier in 2015 for their series.

It was later revealed that Veliki brat would start on September 4, with Antonija Blaće and Sky Wikluh (who previously participated in the format) as the hosts. The Final took place on 12th December. This is the first season of the series won by a Macedonian housemate.