Yitzhak Moda'i (Hebrew: יצחק מודעי, born 17 January 1926, died 22 May 1998) was an Israeli politician, who served five terms in the Knesset for Likud and then the New Liberal Party over the course of a 20-year career.
Born in Tel Aviv during the Mandate era, Moda'i attended High School in Tel Aviv before studying at the Technion in Haifa, later becoming chairman of the Technion Graduates Association in 1961. He went on to study law at the Tel Aviv branch of Hebrew University of Jerusalem, and law and economics at the London School of Economics.
In 1961 he joined the Liberal Party, and was a member of its directorate between 1965 and 1968. From 1969 until 1973 he served as a member of Herzliya's municipal council.
On 16 April 1986 he switched to the Minister of Justice, before leaving the cabinet on 23 July that year. He returned to the government as a Minister without Portfolio in November. Between 1984 and 1988 he also served as chairman of the Liberal Party's presidium.
After the 1988 elections he was appointed Minister of Economics and Planning, before returning to the Finance portfolio in 1990. On 15 March 1990 he and four other MKs (all of them former members of the Liberal Party) broke away from Likud to form the Party for the Advancement of the Zionist Idea, later renamed the New Liberal Party; however, the new party remained in the government and Moda'i became Finance Minister again in 1990.
His wife, Michal Moda'i, was Miss Israel, and then president of the Women's International Zionist Organization World. They had three children. the eldest, Harela, killed in a car accident when she was 22. Prize is awarded annually Army Radio commander in her name. Son, Boaz Modai, is a senior diplomat in the Foreign Service since September 2010 serving as Israel's ambassador to Ireland