Muhammet Haydar Demirel (born April 1, 2000) is a Turkish curler from Erzurum, Turkey.

Demirel made his international debut at the 2017 European Youth Olympic Winter Festival, at home in Erzurum throwing third on the Turkish team, skipped by Oğuzhan Karakurt.

After finishing the round robin with a 2–2 record, the team lost in the semifinals and in the bronze medal game, settling for fourth.

[2] Demirel was a member of the Turkish men's junior team at three World Junior-B Curling Championships from 2018 to 2019.

This time, the team finished with a 5–2 record in pool play, making the playoffs, where they lost to South Korea in the quarterfinals.