ONE Fight Night 14

ONE Fight Night 14: Stamp vs. Ham was a combat sport event produced by ONE Championship that took place on September 30, 2023, at the Singapore Indoor Stadium in Kallang, Singapore.

Background
The event marked the promotion's return to Kallang, Singapore and first since ONE Fight Night 8 in March 2023.

An interim ONE Women's Atomweight World Championship bout between former ONE Women's Atomweight Muay Thai and Kickboxing Champion Stamp Fairtex and former Rizin Women's Super Atomweight champion Ham Seo-hee headlined the event. The fight was promoted to the undisputed title due to then champion Angela Lee announced her retirement and vacated the title during the event.

A rematch for the ONE Women's Strawweight Muay thai World Championship between current champion Smilla Sundell and Jackie Buntan was expected to take place at the event. The pair previously faced each other in April 2022 at ONE 156, which Sundell won the title by decision unanimous. However, Buntan pulled out from the bout due to family matters. She was replaced by current ONE Women's Atomweight Muay Thai champion Allycia Rodrigues.

The inaugural ONE Women's Atomweight Submission Grappling World Championship bout between Danielle Kelly and 2018 Asian Games gold medalist in Ju-jitsu Jessa Khan took place at the event.

A bantamweight bout between former ONE Bantamweight Champion John Lineker and Stephen Loman took place at the event. The pairing was previously scheduled to meet at ONE on TNT 4 in April 2021, but Loman withdrew from the bout due to tested positive for COVID-19.

At the weigh-ins, Xiong Jing Nan failed hydration despite making weight. The bout proceeded at a catchweight of 129 pounds, with Xiong being fined a percentage of her purse, which went to her opponent Wondergirl Jaroonsak.

Bonus awards
The following fighters received $50,000 bonuses.
 * Performance of the Night: Stamp Fairtex, Smilla Sundell and Asa Ten Pow