Ubayd Haider (born Nathaniel Singh; 1998 or 1999 – November 10, 2024) was a Fijian professional boxer who competed between 2019 and 2024. The self-styled "Prince of Fiji", in 2024, he held the Fijian Super featherweight title. While contesting the International Boxing Organization (IBO) Asia Pacific Featherweight title, Haider was knocked unconscious, slipped into a coma and died two weeks later at age 25.