Ivan Ahčin (March 9, 1897 – February 14, 1960) was a Slovene sociologist, journalist, author, and politician.

After the assassination of Natlačen by Slovene communist agents in October 1942, Ahčin emigrated to Rome, from where he contacted the Yugoslav government in exile in London and became one of the main advisors of the exiled Slovene conservative politician Miha Krek.

After 1945, Ahčin moved to Argentina, where he worked as a professor at the University of Buenos Aires's Faculty of Theology.

[2] In 1999, two historians from Ljubljana, Bojan Godeša and Ervin Dolenc, published Ahčin's memoirs of the period when he worked with Anton Korošec.

The book, entitled Izgubljeni spomin na Antona Korošca (The Lost Memory of Anton Korošec), was published by Nova Revija, and it reopened the discussion of the role of Anton Korošec in Slovene history.