Horacio Marcelo Elizondo (born November 4, 1963) is an Argentine former international football referee best known for his officiation throughout the 2006 FIFA World Cup.

In the 2005 tournament the two Brazilian finalist teams São Paulo FC and Atlético Paranaense lobbied Conmebol to have Elizondo as the main referee.

[6] Elizondo broke the Argentine First Division record showing 12 yellow cards on August 19 in the match between Boca Juniors and Independiente.

[7] In the annual world referee ranking of the International Federation of Football History and Statistics (IFFHS), Elizondo was positioned 5th in 2001,[8] 12th in 2005[9] and 1st in 2006.

[10] Elizondo was appointed to represent Argentina in the 2006 FIFA World Cup, together with fellow assistants Darío García and Rodolfo Otero.

[12] FIFA's president of the World cup organizing committee Lennart Johansson praised Elizondo performance at the match, saying "I did not notice him much which is a very good thing.

Elizondo handed out nine yellow cards during the match, booking five Swiss players, Philippe Senderos, Hakan Yakın, Raphael Wicky, Christoph Spycher and Johan Djourou and four Koreans Park Chu-Young, Kim Jin-Kyu, Choi Jin-Cheul and Lee Chun-Soo.

[21] Elizondo gave Zinedine Zidane a red card after he headbutted in the chest Marco Materazzi in the 111th minute after consulting fourth official Luis Medina Cantalejo via headset.