Eli Pariser (born December 17, 1980 in Lincolnville, Maine) is the former Executive Director of MoveOn.org, and the organization's current Board President.

Pariser's rise to prominence as a political activist began when he and college student David H. Pickering launched an online petition calling for a nonmilitary response to the attacks of September 11th. In less than a month, half a million people had signed the petition and in November of that year, Moveon.org founders Wes Boyd and Joan Blades asked Pariser to join their organization.

During the 2004 US Presidential Election, Pariser co-created the Bush in 30 Seconds ad contest and raised over $30 million from small donors to run ads and back Democratic and progressive candidates. Writing for The New York Times Magazine in 2003, journalist George Packer referred to MoveOn as the "mainstream" element of what "may be the fastest-growing protest movement in American history."