William Lionel Wyllie (1851–1931) was a British painter and etcher renowned for his maritime scenes, particularly those depicting the Royal Navy and the Thames River. His career spanned both fine art and illustration, and he became a prominent figure in the late Victorian and Edwardian art world. Wyllie’s work is celebrated for its atmospheric detail and technical precision, often capturing the daily life and grandeur of naval vessels. He was an official war artist during World War I and is best known for his panoramic painting of the Battle of Trafalgar, which hangs in the Royal Naval Museum in Portsmouth. His legacy remains influential in the field of marine art.