Aivars Endzinš (born 8 December 1940 in Riga) is a Latvian lawyer and politician.
He graduated from the University of Latvia in 1968 and in 1977 attained a candidate of legal sciences degree.
In 1997 he became a Doctor of Jurisprudence.
He has worked as a lecturer at the University of Latvia and at the Turiba School of Business Administration.
He was a member of the Communist Party of the Soviet Union from 1963 to 1990, when he became a member of the Popular Front of Latvia and a member of the Supreme Council of the Republic of Latvia.
He was for a short time a member of Latvian Social Democratic Workers' Party, and in 1993 became a member of Latvian Way.
He was a member of the 5th and 6th Saeimas, but resigned in 1996 to become a judge on the Constitutional Court of Latvia.
He became the Chief Justice of the Constitutional Court in 2000 and left this office in 2007.
He was a presidential candidate in the 2007 Latvian presidential election, nominated by Harmony Centre and supported by the New Era Party and the political alliance For Human Rights in a United Latvia.
After a passionate debate over his membership of the Communist Party, which included a revelation that in the 1970s he had denied the occupation of Latvia, he lost the election to Valdis Zatlers.