The Greater Jacksonville Kingfish Tournament (GJKT) is a King mackerel fishing contest held over six days in July in Jacksonville, Florida. It is the world's largest kingfish tournament.  According to Rick Ryals, a local boat captain, the GJKT is "true competition in its purest form. It doesn’t matter how big your boat is or how much it costs. There are no secret weapons. There is only good solid preparation and the luck of the draw."
 In 1980, a handful of Jacksonville businessmen including Bob Gipson, Walt Murr and Pete Loftin resolved to create a fishing contest like the ones offered in Miami and Fort Lauderdale. The first tournament was staged in 1981 at the Beach Marina on Beach Blvd. at the Intracoastal Waterway. Commuters on their way home would stop, relax and enjoy the event.  
For thousands of spectators, it became more of a food festival than a fishing tournament. That changed drastically in 1996, when the tournament was moved to Sisters Creek Park, a much larger area but more remote. A newspaper reporter stated that "Sister's Creek (Park) isn't 'on the way' to anywhere from anywhere. If you're headed that way, you're pretty much headed there." The location is ten miles northeast of the city center, down a winding, two-lane road.
 By the tenth year of the tournament, the event was firmly established and had grown so large that a legal entity was needed to take responsibility for signing contracts and handling finances. Jacksonville Marine Charities, Inc. (JMC) was founded in 1991 as a 501(c)(3) non-profit organization to run the tournament and distribute the proceeds. Leona Sheddan was executive director of the tournament for eight years. The projects that JMC supports must be marine-oriented and originate with another not-for-profit group. In its history, JMC has awarded over $650,000 to other non-profits, which has benefited all Floridians, as well as First Coast residents.
 Current and past projects have included: 
 For the 25th tournament in 2005, special events were added to the week's activities. The GJKT invited all the previous first, second and third-place winners to participate in a Tournament of Champions on Monday, and offered a $10,000 cash prize. The VIP Tournament, also on Monday, had $50,000 in cash for the winner, and the Yamaha Pro Kingfish Tour held a two-day contest for the biggest two-fish catch with $40,000 in cash. The Junior Angler Tournament was Tuesday, then the Greater Jacksonville Kingfish Tournament was Thursday and Friday, with cash and prizes valued at over $400,000.

 The history of the GJKT has been relatively free of controversy; the first exception being 2007.
Scott Senecal had the highest total weight for two fish at 66.95 pounds at the end of the second day. Later in the evening, tournament officials discovered that Senecal's Contender 23T was actually a 25-foot boat and not eligible for the 23 Class. His entry was moved into the Ultra category due to "a clerical error on our part" by the tournament official present. The next morning, executive director Mike Wheeler erroneously stated that 2nd-place finisher Don Combs had filed a protest, and the rules committee would meet in the afternoon. Senecal was invited to attend, but he chose not to. Jeff Royer, tournament director, called Senecal to inform him that he had been disqualified for an improper application form by leaving his boat length blank. When asked to cite the rule for application omissions, Royer admitted there wasn't one, but he insisted that Senecal violated the rule that says boat classification changes can only be made prior to the start of fishing. However, the GJKT originally stated that he had not specified a class.
After witnessing public outrage on Sunday and Monday, the GJKT acknowledged some responsibility for the problem, and on Tuesday gave Senecal a prize equal to the one he had lost. He was also awarded first place in a special category. However, some of the anger was directed towards Don Combs, who did nothing wrong. On several websites, he was portrayed as a bad guy by individuals who were ignorant of the facts. The GJKT did nothing to restore Comb's reputation.
 The second controversy occurred in 2019 when Randy Howell's 52.56-pound fish was initially accepted at the late weigh in, despite a large bite from a shark. The tournament has a rule which excludes mutilated fish that have "any damage which impairs the fish's fighting ability", so the owner of the next biggest fish filed a protest. The rules committee looked at the damage and disqualified the fish ruling that the fish's "ability to fight was no longer absolute".
 Jim King was a popular and powerful Florida senator from Jacksonville, but he always found time for the GJKT and was the voice of the tournament for more than 25 years. His favorite spot was a seat where he could see the boats return to weigh their catch, and provide a humorous commentary. 
Jim Sutton, a reporter for the Florida Times-Union, wrote that "Jim King can talk for hours without noticeably taking a breath. He can be darn funny doing it, and he personally knows 80 percent of the captains and crews that hit the dock for weigh-ins."
 After his death in July 2009, Sisters Creek Marina Park was renamed Jim King Park & Boat Ramp at Sisters Creek in King's honor.
 The Late-2000s recession had an extreme impact on the sport marine industry. Job losses and cutbacks affected discretionary recreational spending more than most market segments. New boat sales were nil, so manufacturers cut their sponsorships. Some fisherman were forced to give up their boat ownership or team up with friends to save expenses. The tournament had not covered  expenses since 2004 and had spent $200,000 of their reserve fund to compensate, so in 2009 the board of directors made drastic changes to daily activities to ensure the future of the event. Two paid positions, an executive director and assistant were both eliminated to save over $90K per year. Bob Gipson, one of the tournament founders, resigned from the board of directors and assumed the executive director position at no salary. He then examined virtually every facet of the operation to reduce expenses.
 Professional and amateur anglers compete side by side for as much as $500,000 in cash and prizes, depending upon the total number of entries.
The rules permit the registration of up to 1,000 boats, each with as many as four anglers, for an entry fee that was $400 in 2010. There are prizes for the heaviest single kingfish, pair of kingfish, and the largest cobia. Five kingfish caught in the week preceding the tournament are tagged, and there is a prize for catching them. Sponsors often offer prizes for the largest fish caught using their products.    
The tournament attracts approximately 20,000 spectators who watch the weigh-in and enjoy the festivities. The tournament is traditionally capped off with a substantial fireworks display sponsored by the City of Jacksonville.
 This event was always held the first day of the tournament week, matching celebrities, politicians & big contributors with knowledgeable fisherman for a one-day fun outing. It was discontinued in 2008 due to high operational expenses and limited benefit.
 First held in 1991 for those under 16, it is a family event to promote good sportsmanship, conservation awareness and fun. The $10 (per angler) entrance fee has not changed since the Junior Angler tournament's inception, and prizes are awarded based on Kingfish weight. The boat used by the junior angler must be registered in the regular tournament.
 All the fish caught and weighed become the property of the tournament, but they don't go to waste. Within minutes, they are gutted and iced down by Ed Thomas, a professional from Safe Harbor Seafood Market. They are shipped all over North America and consumed (mostly) by non-American ethnic groups who like the taste and low price (less than $2.75/lb). The tournament is paid just under $1 per pound for 5-8 tons of fish.
 The tournament relies on volunteers to maximize the proceeds available for charities. As many as 400 individuals donate their time to make the event a success. A few people have actually served in every previous contest.
 The Walt Murr Award honors an outstanding volunteer during the annual Tournament. The award was established during 1987 in honor of the first tournament chairman, Walt Murr. The honoree is selected by the board of directors upon recommendation from the current tournament chairman and vice chairmen.