Ahmad Hilles (أحمد حلس) was born in 1951 into a prominent Gazan family from the Shuja'iyya neighbourhood of Gaza City. He joined Fatah in the early 1970s and is a member of its Central Committee. He was previously secretary-general of Fatah in Gaza.
Hilles was a prominent Fatah militant in Gaza, imprisoned by Israel several times for his military activities. During this time, he reportedly developed strong ties to Farouk Kaddoumi and Fatah's deputy leaders Khalil al-Wazir (Abu Jihad) and Salah Khalaf (Abu Iyad).
In March 2019, Hilles was reportedly the target of an attempted assassination attack by unknown assailants in Gaza.