Exhibit 99.1 OneSpaWorld Reports Record Fourth Quarter and Fiscal Year 2023 Results Reaffirms Fiscal Year 2024 Guidance Introduces First Quarter 2024 Guidance of $204 to $209 Million in Revenue and $21.5 to $23.5 Million in Adjusted EBITDA Nassau, Bahamas, February 28, 2024 – OneSpaWorld Holdings Limited (NASDAQ: OSW) (“OneSpaWorld,” or the “Company”), the pre-eminent global provider of health and wellness services and products on-board cruise ships and in destination resorts around the world, today announc ...