Yahya Ibrahim Hassan Sinwar (Arabic: يحيى إبراهيم حسن السنوار, romanized: Yaḥyá Ibrāhīm Ḥasan al-Sinwār; 29 October 1962 – 16 October 2024) was a Palestinian militant and politician who served as fourth chairman of the Hamas Political Bureau from August 2024, and as the second leader of Hamas in the Gaza Strip from February 2017, succeeding Ismail Haniyeh in both roles. He was killed in a clash with the Israel Defense Forces (IDF) in October 2024.
Sinwar was born in the Khan Yunis refugee camp in Egyptian-occupied Gaza in 1962 to a family who had been expelled or fled from Majdal 'Asqalan during the 1948 Palestine War. He finished his studies at the Islamic University of Gaza, where he received a bachelor's degree in Arabic studies. In 1989, Sinwar was sentenced to four life sentences in Israel for orchestrating the abduction and killing of two Israeli soldiers and four Palestinians he considered to be collaborators. He spent 22 years in prison until his release among 1,026 others in a 2011 prisoner exchange for Israeli soldier Gilad Shalit. During his time in prison, Sinwar continued to coordinate the military activities of Hamas. Sinwar was one of the co-founders of the security apparatus of Hamas.