Marijan Brkić (born 20 January 1962), also known under the nickname Brk, is a Croatian guitarist and producer, best known for his work with Croatian bands such as Parni Valjak and Prljavo Kazalište, and solo artists, including Zlatan Stipišić Gibonni.

He is one of the most popular Croatian guitarists and session musicians, and is also known as a composer, songwriter, arranger, producer and sound engineer.

Since he joined them, Parni Valjak has released eight albums, both studio and live, as well as compilations.

He remained with Parni Valjak until the band's farewell tour and last performance in December 2005.

In November 2007, he released his first solo album called Bolji Svijet (A Better World), featuring collaborations with Croatian musicians such as Gibonni, Toni Cetinski, Aki Rahimovski, Dado Topić, Berislav Blažević, etc.