The Swedish company announced Monday that Ohlsson, who has been chief executive since 2009, will be replaced in September 2013 by Peter Agnefjall.
Agnefjall, 41, is currently country manager of Ikea Sweden.
He has temporarily been appointed vice-president of the group until he takes over the top post.
He has held several leadership positions in the group since 1995, including as assistant to Ikea founder Ingvar Kamprad.
Ikea employs 131,000 people in 41 countries. It served 655 million customers at some 290 stores in 2011.