Mehmet Hasan Altan (born 11 January 1953) is a Turkish academic economist, journalist, and author of over 25 books.
Describing himself as a "Marxist-liberal", he is the originator of the term "Second Republic", arguing that Turkey needs to reconstitute its republic as a true democracy.
He was later indicted on charges of attempting to overthrow the constitutional order and acting on behalf of a terrorist organization.
The Constitutional Court of Turkey ruled on 11 January 2018 that his rights as a journalist had been violated, but his subsequent application for release was rejected by Istanbul Assize Court.
On 16 February 2018 he was sentenced to life in prison.
In response to this, on 20 March 2018, the European Court of Human Rights (ECHR) made a ruling that determined that his rights under the European Convention on Human Rights had been violated, namely Article, namely Article 5 § 1 (right to liberty and security) and Article 10 (freedom of expression).