William Frederic Schelter (born in 1947, died in 2001 in Russia) is a Canadian data processing specialist and a Professor at the University of the Texas, with Austin.

It developed the free version under License LPG of the system of formal calculation Maxima as one of the first Compilateur S C-Ansi (if it is not the first) and GNU CommonLisp.

It developed the Graphical interface and the tools of débuggage and development of Maxima.