Demirel is a Turkish surname meaning "iron hand." Notable people with the surname include:
Bektaş Demirel (born 1976), Turkish judoka
Hakan Demirel (born 1986), Turkish basketball player
Mithat Demirel (born 1978), Turkish-German basketball player
Nazmiye Demirel (1927–2013), First Lady of Turkey
Süleyman Demirel (1924-2015), Turkish politician, former prime minister and state president
Volkan Demirel (born 1981), Turkish football goalkeeper
Yeşim Demirel (born 1990), Turkish-German women's footballer
Mehmet Cüneyd Demirel (born 1980), Turkish hydrologist
Selman Demirel (born 1983), Turkish captain, second officer
Mahmud Sami Demirel (born 1985), Turkish geophysical engineer
