Ehud Olmert (Hebrew: אהוד אולמרט‎, IPA:   ( listen), born 30 September 1945) is an Israeli political figure, and former Prime Minister of Israel having served from 2006 to 2009. Olmert was the mayor of Jerusalem from 1993 to 2003. In 2003 he was elected to the Knesset and became a minister and Acting Prime Minister in the government of Prime Minister Ariel Sharon. On 4 January 2006, after Sharon suffered a severe hemorrhagic stroke, Olmert began exercising the powers of the office of Prime Minister. Olmert led Kadima to a victory in the March 2006 elections (just two months after Sharon had suffered his stroke) and continued on as Acting Prime Minister. On 14 April, two weeks after the election, Sharon was declared permanently incapacitated, allowing Olmert to legally become Interim Prime Minister. Less than a month later, on 4 May, Olmert and his new, post-election government were approved by the Knesset, thus Olmert officially became Prime Minister of Israel.

Olmert and his government enjoyed healthy relations with the Fatah-led Palestinian National Authority, which culminated in November 2007 at the Annapolis Conference. On the other hand, during his tenure as Prime Minister, there were major military conflicts with both Hezbollah and Hamas (predominately in the Gaza Strip). Olmert and Minister of Defense Amir Peretz were heavily criticized for their handling of the 2006 Lebanon War. In late 2008, a ceasefire between Hamas and Israel ended, which led to the 2008–2009 Israel–Gaza conflict. Olmert declared that the Israeli Defense Force would target the Hamas leadership and infrastructure in the war.

Throughout his premiership, Olmert was accused of corruption. Facing a challenge for the leadership of Kadima from Foreign Minister Tzipi Livni, on 30 July 2008, Olmert announced that he would not seek re-election as party leader and that he would resign from his position as Prime Minister immediately after a new Kadima leader was named. Livni won the contest and sought to form a new government in September of that year. However, Livni's attempts at forming a new government were unsuccessful and instead an election was scheduled for February 2009. On February 20, Israeli President, Shimon Peres, chose Benjamin Netanyahu to become the new Prime Minister and asked him to form a Coalition Government, after there was no clear victory in the elections. Netanyahu succeeded Olmert on 31 March 2009.