Ali Mohamed Shein (born 13 March 1948) was the 7th President of Zanzibar,[1] from 2010 to 2020.

Shein is originally from the island of Pemba, and he is a member of the ruling Chama Cha Mapinduzi (CCM) party.

Shein was appointed by the President of Zanzibar to be a Member of the House of Representatives on 29 October 1995.

From 6 November 2000, he was a Member of the House of Representatives at Mkanyageni Constituency in Zanzibar before being appointed to be a Minister of State, President's Office, Constitution, and Good Governance in Zanzibar on 22 November 2000, and Vice President of Tanzania in July 2001.

Shein got 117 votes while Bilali and Shamsi Vuai Nahodha got 54 and 33 respectively and was elected a new president of Zanzibar and the only one from Pemba Island by 50.1% on 31 October 2010.