The Tag League the Best (タッグリーグ・ザ・ベスト Taggu Rīgu Za Besuto?) was an annual professional wrestling tag team tournament, founded by All Japan Women's Pro-Wrestling (AJW), which held it from 1985 to 2004 (with no tournament taking place in 1990). After the folding of AJW in 2005, the tournament was adopted by its one-time rival and later associate promotion, JWP Joshi Puroresu, which held it annually from 2011 to 2016.
The tournament is usually held under round-robin rules with only the 2004 and 2016 tournaments having been held in a single-elimination format. The tournament's points system has varied throughout the years. From 1985 to 1992, a win was worth one point, a draw half a point and a loss zero points. From 1993 onwards a win has been worth two points, a draw one point and a loss zero points. When JWP took over promoting the tournament in 2011, it was moved to the beginning of the year from its usual position at the end of the year. JWP was also the first to introduce two round-robin blocks in the tournament instead of the usual single block system used by AJW. In AJW, the winners usually received a shot at the WWWA World Tag Team Championship, were they not already the reigning champions, while in JWP the tournament was used to determine the number one contenders to the unified Daily Sports Women's and JWP Tag Team Championships.
Due to the tournament's unusual name, it has sometimes been referred to as "The Best Tag (Team) League" by English language reporters, however, the tournament's Japanese promoters have always called it "Tag League the Best".