David A. Trampier (April 22, 1954 – March 24, 2014) was an artist and writer whose artwork for TSR, Inc. illustrated some of the earliest editions of the Dungeons & Dragons role-playing game. Many of his illustrations, such as the cover of the original Player's Handbook, became iconic. Trampier was also the creator of the Wormy comic strip that ran in Dragon magazine for several years.

At the height of his career in the late 1980s, Trampier suddenly withdrew from the gaming world and became a social recluse. Although the reasons for this break were unclear, a disagreement with TSR is possible; it is clear that later in life, Trampier wanted nothing to do with TSR or its successor, Wizards of the Coast. For many years, Trampier's location was unknown to anyone and rumors circulated that he had died; his brother-in-law Tom Wham denied this, although Wham admitted that even he did not know where Trampier was or what he was doing.

Trampier was inducted into the AAGAD (tabletop gaming) Hall of Fame posthumously in 2024 as part of the 50th anniversary of the HOF.

In 1977, TSR, Inc. started to develop a new version of their popular Dungeons & Dragons role-playing game called Advanced Dungeons & Dragons (AD&D). Unlike TSR's previous rulebooks, which had been low-quality paperback booklets, the rulebooks for AD&D would be high-quality lithographed hard covers featuring full color wrap-around cover art and many interior black & white illustrations. The first book to be published was the Monster Manual in 1977, and Trampier, along with fellow artists David Sutherland and Tom Wham, provided artwork for the manual. Tim Kask, editor of Dragon magazine, stated in a review that the book's profuse illustrations were "outstanding", and that the illustrations "in themselves would warrant the cover price".

It was the next hardcover rulebook, the Player's Handbook, that would secure Trampier his reputation while he was still in his mid-twenties. Trampier's cover depicted a temple dominated by a huge, devilish statue being looted by a group of adventurers; the back cover included a representation of the book's author, Gary Gygax. The cover image became synonymous with the game until the cover art was replaced with a new illustration in 1982. Trampier also created several pieces of interior art for the Player's Handbook.

He continued to be an important contributor to the TSR brand in the company's early years. Some of his more notable works included:

The September 1977 issue of Dragon (Issue #9) featured a new 6-panel comic, Trampier's Wormy. The first frame featured the title character, a cigar-chomping, pool hustling, wargaming dragon, and subsequent issues revealed the cast of trolls and ogres who were his neighbors and friends. The stories were told from the point of view of the antagonists of the Dungeons & Dragons game; the wizards, warriors and other protagonists that players would be expected to portray were inevitably presented as unwelcome intruders. Wormy continued to appear in Dragon for the next 10 years, until Issue #132 (April 1988).

In 1980, Trampier and Jason McAllister co-designed a "monster slugathon" wargame called Titan, for which Trampier also executed the artwork. The purpose of the game was simply to defeat other players' armies, using the victories to advance in power until there was only one army left. Trampier and McAllister self-published the game through Gorgonstar Company. It was re-published by Avalon Hill in 1982 and gained a measure of popularity. Articles about Titan were featured in several issues of Avalon Hill's General magazine, and it remained in print until Avalon Hill's demise in 1998. In 2008, Valley Games printed a new edition of Titan without Trampier's artwork.