The G1 (Grade One) Climax (G1（グレードワン）クライマックス, Gurēdo Wan Kuraimakkusu) is a professional wrestling tournament held each August by the New Japan Pro-Wrestling (NJPW) promotion. Though it has sometimes been held as a single-elimination tournament, it is usually – and currently – held as a round-robin, with the most victorious wrestlers in each pool wrestling in a short tournament to decide that year's winner. Since 2012, the winner of the tournament earns the right to challenge for the IWGP World Heavyweight Championship at the following January's Wrestle Kingdom show.
In its current format, the tournament lasts four weeks. The winner of each pool is determined by a points system; two points for a victory, one point for a draw, and zero points for a loss or no contest. Under the current format, double decisions (such as double count-outs or double disqualifications) are treated as draws.