Jennell Allyn Jaquays (born Paul Jaquays; October 14, 1956 – January 10, 2024) was an American game designer, video game artist, and illustrator of tabletop role-playing games (RPGs). Her notable works include the Dungeons & Dragons modules Dark Tower and Caverns of Thracia for Judges Guild; the development and design of conversions on games such as Pac-Man and Donkey Kong for Coleco's home arcade video game system; and more recent design work, including the Age of Empires series, Quake II, and Quake III Arena. One of her best known works as a fantasy artist is the cover illustration for TSR's Dragon Mountain adventure.

Raised and educated mostly in southern Michigan, Jaquays and friends were early adopters of the D&D game, starting a game club which published a role playing fandom newsletter The Dungeoneer, much of which was written and illustrated by Jaquays. By 1976, Jaquays was contributing to Dragon magazine while bringing the newsletter to Judges Guild. During the first twenty years of the table top role playing industry, Jaquays's writing and art were published by Chaosium, Metagaming, Steve Jackson Games, Flying Buffalo, West End Games, Iron Crown Enterprises, Game Designers' Workshop, and Task Force Games. Jaquays also influenced the video game industry with significant works at Coleco, id Software, and Ensemble Studios. In 1995, collaborating with Lester W. Smith, Jaquays developed the Dragon Dice collectable dice game for TSR, contributing stylized dice icons and cover art.

Jaquays is regarded as an influential pioneer in the adventure game community. While working in Texas, Jaquays cofounded The Guildhall at SMU, a graduate-level game design education program at Southern Methodist University. Inducted in 2017 into the Academy of Adventure Gaming Arts & Design's Hall of Fame, Jaquays was posthumously given a Kate Wilhelm Solstice Award by the Science Fiction and Fantasy Writers of America for her "significant impact on the science fiction or fantasy landscape" in 2024. In the field of game design, "Jaquaysing" is a term which refers to a multiple path, non-linear, sometimes extra-dimensional approach in scenario writing, considered an innovation created by Jaquays.

Jaquays was born on October 14, 1956, in Michigan and grew up in Michigan and Indiana. Jaquays graduated from Michigan's Jackson County Western High School in 1974 and Spring Arbor College in 1978 with a Bachelor of Arts in Fine Art.

While still at college, Jaquays became interested in science-fiction and fantasy gaming and the nascent role-playing game industry through the pages of The Space Gamer which her brother had shared with her. Jaquays began playing Dungeons & Dragons in 1975 and created the Fantastic Dungeoning Society (FDS) with several college friends including Mark Hendricks. One of their projects was to publish a fanzine that would include adventures that other gamemasters could use. Tim Kask from TSR granted Jaquays a casual license to publish this amateur fanzine, and The Dungeoneer became one of the earliest periodicals for role-playing games.

The first issue, released in the same month as Dragon #1 (June 1976), was drawn and written primarily by Jaquays, with contributions by other members of the FDS. From 1976 to 1978 the FDS published six issues of The Dungeoneer. Marketed as a "dungeonmaster's publication," the magazine was noteworthy for its pioneering approach to pre-factored adventures. The first one, F'Chelrak's Tomb, appeared in June 1976, the same month as Wee Warriors published Palace of the Vampire Queen, known as the first published standalone fantasy role-playing adventure. The Dungeoneer proved to be an inspiration for many similarly-themed magazines in the United States and elsewhere.

In addition to these "honest efforts at quality contents to interest readers," Jaquays began submitting artwork to TSR in 1976. Jaquays' work appeared in the premiere issue of The Dragon, and later contributions included the cover of issue #21.

Jaquays was preparing for graduation by late 1977 which meant spending more time working in the art studio, so FDS sold The Dungeoneer to Chuck Anshell of Anshell Miniatures. Anshell soon came to work at Judges Guild, a prolific provider of material and officially licensed products for TSR's Dungeons & Dragons (D&D) line, and brought The Dungeoneer with him; it became one of Judges Guild's two gaming periodicals. Jaquays also began working at Judges Guild in October 1978, spending a year there as an illustrator and designer for adventures, but refused to move to Decatur to work on-site at Judges Guild. Instead Jaquays worked out an arrangement to work from home in Michigan. Jaquays worked on two stand-alone D&D modules for Dungeons & Dragons, Dark Tower and Caverns of Thracia, which were completed before she left the company in October 1979. She provided a variety of content on a freelance basis thereafter, particularly to The Dungeoneer. Jaquays and Rudy Kraft authored Adventures Beyond the Pass for Judges Guild, who never published it; instead Greg Stafford published it through Chaosium as the adventure Griffin Mountain (1981). The MicroGame Chitin: I (1978) by Metagaming Concepts included illustrations by Jaquays. Jaquays, Denis Loubet, and Jeff Dee produced Cardboard Heroes in the early 1980s for Steve Jackson Games.