The 2023 NXT No Mercy was a professional wrestling event produced by WWE. It was the first annual No Mercy held for the promotion's developmental brand NXT, and the 14th overall. The event took place on Saturday, September 30, 2023, at the Mechanics Bank Arena in Bakersfield, California and aired via WWE's livestreaming platforms. This was the first No Mercy held since 2017, the first to livestream on Peacock, the first to be held on a Saturday, and the first to not be available on traditional pay-per-view.

This was WWE's first livestreaming event in which the company was not owned and controlled by the McMahon family, as the company's sale to Endeavor was finalized on September 12, 2023, with WWE and Ultimate Fighting Championship merging to become divisions of a new entity called TKO Group Holdings. NXT No Mercy in turn marked WWE's first livestreaming event under TKO.

Seven matches were contested at the event, including one on the pre-show. In the main event, Raw's Becky Lynch defeated Tiffany Stratton in an Extreme Rules match to retain the NXT Women's Championship. In another prominent match, Ilja Dragunov defeated Carmelo Hayes to win the NXT Championship.