David Hardy Lemieux (born November 8, 1970) is an audio and film archivist. He is a Grammy, Juno, and Gemini Award voting member. He is the audiovisual archivist and legacy manager for the Grateful Dead.^[1]

Lemieux is originally from Ottawa, Ontario, Canada, and was educated at Carleton University in Ottawa (BA in history), Concordia University in Montreal (BFA in film studies)^[2] and the University of East Anglia in Norwich, UK (MA in film archiving).

He has been working as the Grateful Dead's audiovisual archivist and CD/DVD producer since September 1999. He was put in charge of the Grateful Dead's vault after the August 1999 passing of original Grateful Dead tape archivist Dick Latvala. Lemieux has produced scores of Grateful Dead CD and DVD releases since 2000, including more than 40 Billboard Top 40 albums. The Dave's Picks series is titled after Lemieux.^[3] He has also produced several CD releases by Jerry Garcia.

Lemieux hosts a daily radio show on The Grateful Dead Channel on SiriusXM Satellite Radio (Channel 23)/Dish Network (Channel 6023), Today in Grateful Dead History, in which he selects a segment of music from that day in the Grateful Dead's history and explains its historical context and other information relating to the selection. He has hosted and produced more than 5,500 shows since its debut in September 2007.

When Lemieux turned 51 in 2021, he began running, which he'd never done before in any capacity. In his first 18 months of competitive running from May, 2022 to October, 2023, Lemieux has completed two marathons, 10 half marathons, and several 10K races.^{[citation needed]}