Eduardo Alberto Duhalde (Spanish pronunciation: [eˈðwaɾdo alˈβeɾto ˈðwalde] (listen); born 5 October 1941) is an Argentine Peronist politician who served as the interim President of Argentina from January 2002 to May 2003. He also served as Vice President and Governor of Buenos Aires in the 1990s.

Born in Lomas de Zamora, he was elected for the local legislature and appointed intendente (mayor) in 1973. He was deposed during the 1976 Argentine coup d'état, and elected again when democracy was restored in 1983. He was elected vice-president of Argentina in 1989, under President Carlos Menem. Duhalde resigned as vice president and was elected Governor of Buenos Aires Province in 1991, and re-elected in 1995.

He ran for president in 1999, being defeated by Fernando de la Rúa. De la Rúa resigned during the December 2001 riots, and Congress appointed the governor of San Luis Province Adolfo Rodríguez Saá as president. When Rodríguez Saá also resigned, Congress appointed Duhalde. During Duhalde's term in office, a huge currency devaluation and an increase of the exchange rate led to a gradual recovery. He successfully supported the candidate Néstor Kirchner against Menem, who sought a new presidential term. Duhalde had political disputes with Kirchner in later years, and is largely retired from politics since his defeat in the 2011 presidential elections.

Duhalde has been accused of having connections to drug trafficking, but there is no evidence of this.