The 2023 NXT Deadline (stylized as DEADL1NE) was the second annual NXT Deadline professional wrestling livestreaming event produced by WWE. It was held primarily for wrestlers from the promotion's NXT brand division. The event took place on Saturday, December 9, 2023, at the Total Mortgage Arena in Bridgeport, Connecticut. The event is based around the Iron Survivor Challenge for men and women, a 25-minute five-person match in which a wrestler attempts to score the most falls in order to win and earn a match for the NXT Championship and NXT Women's Championship, respectively. This was the last WWE event to involve Vince McMahon or any other member of the McMahon family at any capacity before his resignation as chairman of TKO Group Holdings the next month due to the sex trafficking scandal involving a former WWE employee.

Seven matches were contested at the event, including one on the Kickoff pre-show. In the main event, Ilja Dragunov defeated Baron Corbin to retain the NXT Championship. For the event's Iron Survivor Challenges, Trick Williams won the men's, while the women's was won by Blair Davenport. In other prominent matches, Carmelo Hayes defeated Lexis King and in the opening bout, SmackDown's Dragon Lee defeated Raw's "Dirty" Dominik Mysterio to win the NXT North American Championship. The event also notably saw the return of Cora Jade, who had been on hiatus since August 2023.