The Green National Convention is the presidential nominating convention of the Green Party of the United States (GPUS). Though the Green National Committee (GNC) meets annually in a "national meeting", the convention is convened by the GNC once every four years in order to nominate an official candidate in the upcoming U.S. presidential election, and to officially adopt the party platform and rules for the election cycle.
The convention signals the end of the primary season for Greens, and the start of campaigning for the general election of that year; as such, prominent Greens in state and local races are also spotlighted in order to give them the publicity that the convention affords. In contrast to the Republican and Democratic National Conventions, the convention is not merely a formality which endorses the will of the electorate in the primaries, but the final determinant for the nomination. This is because ballot access laws in many states prohibit the Green Party from holding a state-sponsored primary election—only five states were able to meet the requirements in 2004—and others prevent voters from actually registering into the party, thus making it difficult to credential Greens.