Thomas Bird Mosher (1852–1923) was an American publisher out of Portland, Maine. He is notable for his contributions to the private press movement in the United States, and as a major exponent of the British Pre-Raphaelites and Aesthetes as well as other British Victorians. His book styles reflected those of William Pickering (publisher) and the Whittinghams, the books of the Bodley Head, the Daniel Press, the Eragny Press and Charles Ricketts of the Vale Press, among others.