Mladen Zeljković (born 18 November 1987) is a Serbian professional footballer who plays as a right-back for Bečej 1918.
[12] He made his official debut for Čelik in a 2–0 league loss against Zrinjski Mostar on 23 February 2020.
[13] On 3 July 2020, Zeljković left Čelik and joined Serbian SuperLiga club Napredak Kruševac.
[14] The following season he remained in the Balkan region and secured a contract with Dečić in the Montenegrin top division.
[15] After a season in Montenegro, he returned to Serbia the following year to play in the country's third-tier league with Tekstilac Odžaci.