The Fully Informed Jury Association (FIJA) is a United States national jury education organization, incorporated in the state of Montana as a 501(c)(3) not-for-profit organization. It works to educate citizens on their authority when they serve as jurors. FIJA's stated aims are to educate the public, provide commentary on current jury-related cases, and assist defendants with jury authority strategies — including the right to veto bad laws and the misapplication of laws by refusing to convict the defendant. The organization was formed in 1989 by Larry Dodge, a Montana businessman, and his friend Don Doig. It was formed following discussions about forming such a group at the National Libertarian Party convention in Philadelphia in 1989.

In the U.S., every defendant in a criminal case has the right, under Article III, Section 2 and the Sixth Amendment to the U.S. Constitution, to be tried by an impartial jury. If the defendant is acquitted, the Double Jeopardy Clause of the Fifth Amendment forbids the government from putting him or her on trial again. FIJA advises jurors to vote for acquittal if they disagree with the law – a concept known as jury nullification – even if they believe the defendant committed the crime for which he or she is charged.

FIJA has lobbied state legislatures to enact legislation that would explicitly elevate the jury's formerly unspoken power to nullify to an openly acknowledged right. On June 18, 2012, New Hampshire passed a law explicitly allowing defense attorneys to inform juries about jury nullification. FIJA has also proposed abolishing the juror's oath. FIJA has also launched a "Challenge for Churches" program of jury seminars, focusing on "serving justice through conscience". FIJA has also launched a "Lunch Break for Liberty" program to encourage people to use their lunch break to hand out FIJA pamphlets.^{[dead link]}

FIJA activists have demonstrated outside courthouses and handed out literature to potential jurors in hundreds of cases. They have generally not been arrested for doing so. FIJA speculates that this may be because "prosecutors have reasoned (correctly) that if they arrest fully informed jury leafleters, the leaflets will have to be given to the leafleter's own jury as evidence". FIJA and its activists have been involved in litigation over these matters. Another argument is that since FIJA literature is generic, making no reference to any cases potential jurors may be called upon to serve on, its distribution is not jury tampering.

In dismissing an activist's lawsuit for false arrest for disorderly conduct, the U.S. Court of Appeals for the Seventh Circuit stated, "Although advocacy of jury nullification could no more be flatly forbidden than advocacy of Marxism, nudism, or Satanism, we cannot think of a more reasonable regulation of the time, place, and manner of speech than to forbid its advocacy in a courthouse."

Past members include Libertarian Party politician, Mike Fellows. A board member was Robert Anton Wilson.

Some prosecutors and law enforcement professionals are strongly opposed to the notion that juries can nullify undesirable laws. In 2008, Clay Conrad, author of Jury Nullification: The Evolution of a Doctrine, quit the organization, stating that it was "so centered on jury nullification that it was ignoring the numerous threats that exist to the jury as an institution," as evidenced by the fact that the percentage of cases going to jury trial is continually shrinking. Executive Director Iloilo M. Jones described his parting comments as sour grapes motivated by his disappointment at not being able to shift FIJA's focus toward preparing attorneys to pursue jury nullification. Conrad rebutted that the organization needed to teach the importance of the jury system as a whole, not merely the nullification doctrine. FIJA has been condemned as a threat to the system of rule of law rather than rule of men. According to Erick J. Haynie, "it is highly questionable whether jurors should be instructed to 'make' the law when a legislative body has already done the job for them. Congress and the state legislatures have superior expertise, resources and perspective to make macro-social decisions, and much more time to reach a well-reasoned decision than does 'a group of twelve citizens of no particular distinction snatched away from their primary vocations' to spend a couple of days in court.'"

In 2001, Jerry Begly was dismissed from the jury pool after a bailiff noticed he was passing out copies of the Citizens Rule Book, a jury rights publication. The bailiff confiscated the booklets from the recipients and Begly was charged with contempt of court. The judge dropped the charges "in the interest of judicial economy".