The Haven Accord was a diplomatic agreement made by the United Federation of Planets.

This treaty was formed with the Betazoids of Haven II on reference stardate 4/18 and mandated that members of the race be gradually integrated into the staff of exploration vessels of Class V or more. They would be given the position of ship's counselor and the honorary rank of commander, though were not necessarily within the Starfleet chain of command. (FASA RPG module: Star Trek: The Next Generation Officer's Manual)

The FASA RPG made an early and later contradicted assumption the Betazoid race was native to Haven rather than Betazed, and apparently assumes that Deanna Troi was not a member of Starfleet. This stardate is also apparently set sometime in the 25th century in FASA's reference stardate system.