Yes, the Boeing 777 can use Rolls-Royce engines, but it depends entirely on the specific model and the choice made by the original purchasing airline. The first-generation 777s (the 777-200, 777-200ER, and 777-300) offered a choice between three major engine manufacturers: the Rolls-Royce Trent 800, the Pratt & Whitney PW4000, and the General Electric GE90. The Trent 800 was a very popular choice for many international carriers, including British Airways, Emirates, and Thai Airways. However, for the second-generation 777s—the ultra-long-range 777-300ER and the 777-200LR—Boeing entered into an exclusive partnership with General Electric, meaning these specific (and very common) aircraft are powered solely by the GE90-115B. Similarly, the upcoming 777X is exclusively powered by the GE9X engine. In 2026, while many Trent 800-powered 777s are still in service, they are slowly being retired or converted to freighters, making the General Electric variants the dominant "face" of the 777 fleet globally.