Petar Brlek (; born 29 January 1994) is a Croatian professional footballer who plays as a midfielder for Croatian First Football League side Cibalia.
On 27 February 2016, Brlek signed a three-and-a-half-year contract with Polish side Wisà Âa Kraków.
On 24 August 2017, he joined Serie A side Genoa. However, after playing only five matches with the Italian club, on 27 February 2018, he was loaned to his former club Wisà Âa Kraków.
On 31 July 2019, Brlek joined Ascoli on loan until 30 June 2020 with an option to buy.
On 9 December 2024, Brlek signed an eighteen-month contract with Polish third-tier club Wieczysta Kraków, effective from 1 January 2025, with an option for a one-year extension. On 24 August 2025, he left Wieczysta by mutual consent.
On 2 October 2020, he tested positive for COVID-19.