Sean K. Reynolds is an American professional game designer, who has worked on and co-written a number of Dungeons & Dragons supplements for Wizards of the Coast, as well as material for other companies.

[1] Reynolds considers one of his greatest achievements of this time to be the fact that he got TSR/Wotc to relax its "draconian" online policy—enforcement of which in the past was the cause of much bad blood between the company and fans.

[citation needed] Reynolds was let go from Upper Deck in 2008 and contacted Erik Mona at Paizo Publishing looking to do freelance work, and learned there was a job opportunity due to developer Mike McArtor leaving.

[4] In March 2014, Sean left Paizo to move to Indiana[5] and in May 2014 he announced that he was returning to Seattle and Wizards of the Coast for a contract position managing their third-party licensing.

[6] Books he has worked on for the d20-based 3rd edition include the Living Greyhawk Gazetteer, Forgotten Realms Campaign Setting, Savage Species, and Ghostwalk (co-written with Monte Cook).