Branimir Mlačić (born 12 March 2007) is a Croatian professional footballer who plays as a centre-back for Italian Serie A club Udinese. Club career Mlačić joined the Hajduk Split youth system in 2018. He made his debut for the senior team on 31 July 2025, in the club's UEFA Conference League 2–1 away win against Zira FK, aged 18, following Marino Skelin's injury. Mlačić made his league debut on 3 August 2025 against Istra 1961. On 2 February 2026, Mlačić signed a five-and-a-half-year contract with Italian Serie A club Udinese. International career Mlačić made his debut for Croatia national under-18 team on 4 September 2024 in a friendly match against Poland, followed by his debut for the Under-19 team on 22 March 2025. In late September 2025, Mlačić was called up to the Croatia national under-21 team for the first time.