Hamas chief and Oct. 7 mastermind Yahya Sinwar has reemerged after going off the grid for days — leading to speculation that he had been killed, according to a report.

Sinwar resumed contact with Hamas negotiators in Qatar after going radio silent, according to Axios reporter Barak Ravid.

Sinwar, whose status remained unknown after he went quiet on Sep. 22, resurfaced Monday to speak to Hama’s delegation in Doha, Ravid reported. 

Reports circulated last month that Sinwar might have been killed in one of Israel’s airstrikes in the Gaza strip, but officials found no evidence to support the claim. 

Still, both the Israel Defense Forces and the Shin Bet intelligence agency opened a probe into Sinwar to investigate whether he was alive or dead. 

The blood-thirsty terror leader was the head of Hamas in Gaza when militants from the group invaded southern Israel on Oct. 7 and murdered 1,200 people and kidnapped 251 others.

A former Israeli interrogator who spent 180 hours with Sinwar during his time in an Israeli prison said Sinwar is an extremist whose true goal is to destroy Israel and kill all Jews.

It’s not uncommon for Sinwar, who disappeared inside Hamas’ tunnel network on Oct. 10, to go radio silent. 

The terror chief’s tactic has spurred previous false reports of his death, like the one in December following an Israeli airstrike in Khan Younis, where Sinwar once lived. 

Counter-terrorism experts have told The Post that Sinwar is likely avoiding any and all radio communications to steer clear of Israel’s top-rate intelligence network. 

The Hamas leader is most likely relying on couriers to deliver his messages while he hides underground in Gaza. 

It remains unclear what Sinwar’s return to the negotiation table means for the stalled cease-fire deal, as the Hamas chief has repeatedly shot down any hopes for a compromise with Israel.