The Rey de Parejas (Spanish for "King of Tag Teams") is a professional wrestling round-robin tag team tournament held by Dragongate. It was created in 2003 by Toryumon Japan to determine the strongest tag team of the promotion. In 2004, after Último Dragón left Toryumon with the name and trademarks associated, the Toryumon Japan roster and staff formed Dragon Gate and a second Rey de Parejas tournament was held to establish the inaugural Open the Triangle Gate Championship as a spiritual successor to the UWA World Trios Championship.
From 2007 to 2016, the tournament was held as the Summer Adventure Tag League. In 2011, it was held as a single-elimination tournament under the name of Summer Adventure Tag Tournament. In 2012, the tournament featured trios instead of tag teams. In 2023, the tournament was revived as the Rey de Parejas once again.
The tournament is held under a points system, with 2 points for a win, 1 for a time limit draw, and 0 for a loss, no contest or double decision. The two top-scoring teams in each block advance to a single-elimination playoff to determine the winners of the Rey de Parejas.