Duje Ajduković (born 5 February 2001) is a Croatian tennis player.

[3] In August 2023, Ajdukovic won his first ATP Challenger title in Lüdenscheid, Germany after going through the qualifying, defeating Hugo Dellien in the final in straight sets.

He qualified for his first ATP 500 tournament at the 2024 Barcelona Open Banc Sabadell.

He reached his first semifinal as a qualifier at the 2024 Swedish Open in Bastad, defeating Luca Van Assche, eight seed Pavel Kotov and Thiago Monteiro.

[4] Following his second Challenger title in Manacor, after a win over Matteo Gigante in the final, he reached the top 105 in the rankings on 9 September 2024.