William Lloyd Welden, known as Bill Welden, is a linguist, seminal contributor to Parma Eldalamberon, and part of the editorial team for the international Elvish Linguistic Fellowship. He hosted their first symposium ("ELFcon"), of four, in 1991. Specializing in the languages of J.R.R. Tolkien's mythology, Welden has written many articles for Parma Eldalamberon, the journal Vinyar Tengwar for which he is a board member, and the Tolkien Society's formal linguistics journal Quettar. Some of these are co-written with Christopher Gilson.