Graham A. Nelson (born 1968) is a British mathematician, poet, and the creator of the Inform design system for creating interactive fiction (IF) games. He has authored several IF games, including Curses (1993) and Jigsaw (1995).

In 1994, Nelson received a Ph.D. in mathematics from the University of Oxford under the supervision of Simon Donaldson.

Nelson co-edited Oxford Poetry^{[citation needed]} and in 1997 received an Eric Gregory Award from the Society of Authors for his poetry. As of 2004^[update] he was managing editor of Legenda, the imprint of the Modern Humanities Research Association (MHRA).

Nelson is the creator of the Inform design system for creating interactive fiction (IF) games. He has also authored several IF games, including Curses (1993) and Jigsaw (1995), using the experience of writing Curses in particular to expand the range of verbs that Inform is capable of understanding.

Nelson is married to IF writer Emily Short.