The World's Strongest Tag Determination League (世界最強タッグ決定リーグ戦, Sekai Saikyō Taggu Kettei Rīgu-sen), more commonly known in the West as the Real World Tag League, is an annual professional wrestling tournament held by All Japan Pro Wrestling since 1977, usually, run on the first weeks of December. The first tournament was actually called the Open Tag League, but it was renamed to its present name the following year.
 The tournament is held under round-robin rules, with 2 points for a win, 1 for a draw, and 0 for a loss; in earlier tournaments, only a time limit draw would provide the one point, with other methods (such as a Double Disqualification and Double Countouts) providing nothing for either team.
 The name "Real World Tag League" was a mistranslation by AJPW promoter Giant Baba; "saikyō" in Japanese means "strongest," not "real", but Baba used Engrish for promotional material.
 Between 1988 and 1994, the World Tag Team Championship was annually vacated in time for the tournament, which would be used to determine the new champions. The rule was reinstated for the 2012 tournament, but was again ignored the following year, but was reinstated in 2014. In 2000 and 2015 the vacancy was determined by separate post-tournament playoffs between the 2nd and 3rd places.
 Ten-Koji (Hiroyoshi Tenzan & Satoshi Kojima) are the only team to win both the World's Strongest Tag Determination League and its counterpart in New Japan Pro-Wrestling, the World Tag League, as well as the only team to win both tournaments in the same year (2008).
 The 1977 Tag League, featuring 9 teams, was held from December 2 to December 15.
 The 1978 Tag League, featuring 6 teams, was held from December 1 to December 15. Abdullah the Butcher used both The Sheik and Tor Kamata as partners.
 The 1979 Tag League, featuring 7 teams, was held from November 30 to December 13.
 The 1980 Tag League, featuring 7 teams, was held from November 28 to December 11.
 The 1981 Tag League, featuring 9 teams, was held from November 27 to December 13. Winners Bruiser Brody and Jimmy Snuka were the first winners to never win the World Tag Team Championship or its predecessors the International or PWF titles, as Stan Hansen, who had recently jumped from New Japan Pro-Wrestling and helped Brody and Snuka win the final, became Brody's new regular tag team partner beginning the following year.
 The 1982 Tag League, featuring 7 teams, was held from November 26 to December 13.
 The 1983 Tag League, featuring 8 teams, was held from November 25 to December 12.
 The 1984 Tag League, featuring 8 teams, was held from November 22 to December 12.
 The 1985 Tag League, featuring 8 teams, was held from November 23 to December 12.
 The 1986 Tag League, featuring 9 teams, was held from November 22 to December 12.
 The 1987 Tag League, featuring 12 teams, was held from November 21 to December 11.
 The 1988 Tag League, featuring 11 teams, was held from November 19 to December 16. It was also to decide the vacant World Tag Team Championship.
 The 1989 Tag League, featuring 10 teams, was held from November 17 to December 6. It was also to decide the vacant World Tag Team Championship.
 The 1990 Tag League, featuring 13 teams, was held from November 15 to December 7. It was also to decide the vacant World Tag Team Championship.
 The 1991 Tag League, featuring 13 teams, was held from November 16 to December 6. It was also to decide the vacant World Tag Team Championship.
 The 1992 Tag League, featuring 11 teams, was held from November 14 to December 4. It was also to decide the vacant World Tag Team Championship.
 The 1993 Tag League, featuring 8 teams, was held from November 13 to December 2. It was also to decide the vacant World Tag Team Championship. Giant Baba replaced Ted DiBiase as Stan Hansen's partner after one match due to injury.
 1Hansen and Ted DiBiase originally defeated Slinger & Smothers in 7:11; however, when Baba replaced DiBiase, the teams wrestled a rematch.
 The 1994 Tag League, featuring 10 teams, was held from November 19 to December 10. It was also to decide the vacant World Tag Team Championship.
 The 1995 Tag League, featuring 10 teams, was held from November 18 to December 9.
 The 1996 Tag League, featuring 7 teams, was held from November 16 to December 6. In an alteration of previous years, each team faced each other twice during the group stage.
 The 1997 Tag League, featuring 10 teams, was held from November 15 to December 5.
 The 1998 Tag League, featuring 8 teams, was held from November 14 to December 5.
 The 1999 Tag League, featuring 8 teams, was held from November 13 to December 3.
 The 2000 Tag League, featuring 8 teams, was held from November 19 to December 9. Due to a four-way tie for first place, the four teams were placed into a semifinals instead of the traditional one-match final.
 The 2001 Tag League, featuring 8 teams, was held from November 24 to December 7. As with the previous year, the top four teams faced off in the semifinals as a result of a four-way tie.
 The 2002 Tag League, featuring 8 teams, was held from November 23 to December 6.
 The 2003 Tag League, featuring 7 teams, was held from November 22 to December 2.
 The 2004 Tag League was held from November 21 to December 1. It was the first to utilize a multi-block system, featuring 10 teams in two blocks, with the winners of each block facing each other in the final.
 The 2005 Tag League, featuring 10 teams in two blocks, was held from November 20 to December 5.
 The 2006 Tag League, featuring 7 teams, was held from November 19 to December 2.
 The 2007 Tag League featured 8 teams and was held from November 23 to December 9.
 The 2008 league was held from November 22 to December 8 and featured 8 teams.
 The 2009 Tag League, featuring 9 teams, was held from November 23 to December 6.
 The 2010 Tag League, featuring 9 teams, was held from November 20 to December 7.
 The 2011 Tag League, featuring 9 teams, was held from November 19 to December 4.
 The 2012 Tag League was held from November 17 to November 30. It was only the second to utilize a multi-block system, featuring 10 teams in two blocks, with the winners of each block facing each other in the final, contested for the vacant World Tag Team Championship. Kenso and Great Sasuke were forced to pull out of the tournament and forfeit all of their matches after Sasuke suffered a shoulder injury.
 The 2013 Tag League, featuring 8 teams, will be held from November 30 to December 8. Bambi Killer was originally scheduled to take part in the tournament, but was forced to pull out due to a neck injury and was replaced by Kenso.
 The 2014 Tag League, featuring 8 teams, took place from November 16 to December 6. Atsushi Aoki and Hikaru Sato earned a spot in the tournament by winning the 2014 Jr. Tag Battle of Glory in October. The tournament was contested for the World Tag Team Championship, which Jun Akiyama and Takao Omori vacated on October 23 in time for the tournament.
 The 2015 World's Strongest Tag Determination League took place from November 23 to December 6. After their win, Suwama and Miyahara turned on each other.
 The 2016 edition of the World Strongest Tag Determination League took place from December 3 through December 18.
 The 2017 edition of the World Strongest Tag Determination League took place from November 19 through December 12.
 The 2018 edition of the World Strongest Tag Determination League took place from November 13 through December 11.
 The 2019 edition of the World Strongest Tag Determination League took place from November 11 through December 9.
 The 2020 edition of the World Strongest Tag Determination League, featured 8 teams in a single block, taking place from November 18 to December 7. The tournament featured outside participation from Big Japan Pro Wrestling's Daisuke Sekimoto & Abdullah Kobayashi and from Pro Wrestling Zero1's Masato Tanaka. On November 17, it was announced that Zeus had tested positive for coronavirus (COVID-19), leading him to pull out of the tournament and be replaced by his Purple Haze stablemate Izanagi.
 The 2021 edition of the World Strongest Tag Determination League, featured 16 teams in 4 blocks, taking place from November 13 to December 5.
 The 2022 edition of the World's Strongest Tag Determination League reverts back to the single-block format featuring 8 teams. The tournament takes place from November 13 to December 7. The tournament features outside participants from New Japan Pro-Wrestling's Yuji Nagata and Big Japan Pro Wrestling's Takuya Nomura. On November 25, it was announced that Shotaro Ashino would be absent for the remainder of the tournament, due to injury, leading to him and Ryuki Honda to forfeit the remainder of their matches.
 The 2023 edition of the World's Strongest Tag Determination League featured one single block with 10 teams. The tournament took place from November 12 to December 6. The tournament featured outside participants from DDT Pro-Wrestling's Yukio Sakaguchi and Hideki Okatani, JTO's Ren Ayabe, IWRG's Galeno del Mal and Gleat's Hayato Tamura.