The 1999–2000 Copa del Rey was the 98th staging of the Copa del Rey.

The competition started on 1 September 1999 and concluded on 27 May 2000 with the Final, held at the Estadio Mestalla in Valencia.

Note: Barcelona failed to play the second leg due to a fixture clash with UEFA international matches, which left Barcelona with only seven first-team players.

The competition rules at the time for the Copa del Rey allowed sides a maximum of three youth players per match, leaving Barcelona with a squad of ten players for the return leg against Atlético de Madrid.

The ten Barcelona players refused to take to the field as a protest against the Spanish FA (RFEF), thus forfeiting the match.