Khaled Meshaal greeted the crowds of a massed rally in the al-Qatiba complex in Gaza.
The 56-year-old leader of Hamas will address the crowd who have gathered to celebrate the 25th anniversary of the militant group.
Its reckoned around two hundred thousand will take part in what has been called a, “victory rally”.
Meshaal arrived in the Gaza strip for the first time on Friday. The exiled leader has not set foot on the Palestinian territories since 1967.
His visit follows the ceasefire that ended eight days of violence between Israel and Hamas last month.
With a gigantic model of an M75 missile in the background the Hamas leader is expected to unveil a future strategy for the organisation.