Princess Diana - No
Princess Diana of Wales died in a tragic car crash in Paris in 1997, just one year after her divorce from Prince Charles. Her companion Dodi Fayed was also killed in the crash, and her relationship with Fayed (an Egyptian billionaire) immediately led to speculation about Diana embracing Islam, as well as numerous conspiracy theories about her death. A tabloid book, The Diana Chronicles,makes an explicit claim that Diana considered marrying a Pakistani heart surgeon named Hasnat Khan. Despite the notroety and various alleged Muslim romantic attachments, there is no reason to suspect that Diana actually converted at any time.