|Supreme Court of Israel judge|
|President of the Supreme Court of Israel|
|Preceded by||Moshe Smoira|
|Succeeded by||Shimon Agranat|
|Born||19 February 1895|
|Died||5 February 1983(aged 87)|
Olshan was born in Kaunas in the Russian Empire (now Lithuania) in 1895 and immigrated to Ottoman Palestine in 1912. He joined the Hagana and the Jewish Legion. He studied law and oriental studies at the University of London. As an attorney, he represented the Yishuv before the British Mandate of Palestine authorities.
In 1948 he was appointed a Supreme Court of Israel judge. He headed a parliamentary commission to investigate the Israel Defense Forces' (IDF) economy and the Central Elections Committee of the second Knesset. In 1954 he was appointed by Moshe Sharett head of the inquiry commission regarding the Lavon affair with President of the Technion and former IDF Chief of Staff, Yaakov Dori.