Željka Antunović (pronounced [ʒɛ̂ːʎka antǔːnɔʋit͡ɕ]; born 15 September 1955[1]) is a Croatian former politician who served as acting president of the Social Democratic Party between April and June 2007, and as Minister of Defence from 2002 until 2003 in the second cabinet of Ivica Račan.

Born in Virovitica, Antunović entered the political scene in 1990 when she joined the Social Democrats of Croatia (SDH), a centre-left party formed after the establishment of democracy across Yugoslavia – and originally a major rival of the Social Democratic Party (SDP), who had in turn recently succeeded the League of Communists of Croatia (SKH).

However, following disastrous results of the SDH in parliamentary elections, the party accepted the SDP's offer of unification, which occurred in 1994.

On 31 January 2007, Račan announced that he was temporarily leaving politics for health reasons.

She ran for president at the party convention on 2 June 2007, together with Milan Bandić, Zoran Milanović and Tonino Picula.