David Keith Cobb is an American political activist who was the Green Party presidential candidate for the 2004 election.

On January 13, 2004, David Cobb won the first Green primary in the nation, that of the District of Columbia, beating local activist Sheila Bilyeu and several write-in candidates and gaining an early lead in the nomination scramble.

On June 26, on the second ballot, the convention selected Cobb as the Green presidential candidate – a process rocked by controversy as Nader had won the vast majority of actual Green Party votes in nearly all state primary elections (Cobb received only 12.2 percent support).

Since running for president, Cobb has become a member of the Board of Directors for the Green Institute,[3] and of the Sierra Club's national Corporate Accountability Committee,[4] a Fellow with the Liberty Tree Foundation for the Democratic Revolution,[5] on the Steering Committee of Democracy Unlimited of Humboldt County,[6] along with being the group's campaigns director,[7] and is a Principal with Program on Corporations, Law, and Democracy (POCLAD).

[10] Cobb was the campaign manager for Green candidate Jill Stein in the 2016 U.S. presidential election.