The 2025 Heatwave, also promoted as Heatwave: Massachusetts, was a professional wrestling livestreaming event produced by WWE. It was the fourth annual Heatwave produced by the company for its developmental brand NXT, and 11th Heatwave overall. The event took place on Sunday, August 24, 2025, at the Lowell Memorial Auditorium in Lowell, Massachusetts, and was the first Heatwave to solely use the WWE logo as well as be broadcast on Netflix in international markets. This event was also the first Heatwave to feature wrestlers from WWE's partner promotion, Total Nonstop Action Wrestling (TNA).
Six matches were contested at the event. In the main event, Oba Femi defeated Je'Von Evans to retain the NXT Championship. In other prominent matches, TNA's Ash by Elegance defeated Masha Slamovich, also from TNA, and prior champion, Jacy Jayne from NXT, in a triple threat match to win the TNA Knockouts World Championship, and Blake Monroe defeated Jordynne Grace.