- Member of Hamas's Political Bureau (2009–present)
- Secretary of Mujama al-Islamiya
- Head of Mujama al-Islamiya
- Arrested for 6 years (1989–1995) as an official responsible for organizing the Palestinian Mujahideen in the Hamas movement.
In the internal elections for the leadership of the Hamas government in Gaza, held on March 9, 2021, he defeated Yahya Sinwar in the first round by a margin of 7 votes. Sinwar defeated him in the fourth round.[11][12]
On December 13, 2023, the US Department of the Treasury designated Nizar Awadallah as a Specially Designated Global Terrorist linked to Hamas.[13]
In December 2023, it was reported that Awadallah was killed in an airstrike as part of the Gaza war.[14][15] According to another report, he was seriously injured. Awadallah's death was not confirmed by Hamas nor the IDF.
According to Arabic newspaper Asharq Al-Awsat, Awadallah has been a key figure in negotiations during the Gaza war. He currently resides in Doha, Qatar.[16]