The Copa del Rey de Baloncesto (English: Basketball King's Cup) is an annual cup competition for Spanish basketball teams organized by Spain's top professional league, the Liga ACB.

Until the establishment of the ACB in 1983, the Cup was played in its latest rounds with double-legged series and its final as a single game in a neutral venue.

Since the league is played with a round-robin single group, the top seven teams at the end of the first half of the regular season from the Spanish League and the host one, if it is not between these teams, qualify for the tournament.

The eight teams play a knockout tournament at one venue, over four days, eventually producing a winner.

The Copa del Rey is one of the highlights of the Spanish sporting calendar.