He replaced acting CEO Irina Miklienė effective from August 26, according to data from the Center of Registers.
Dahl succeeded Christian Wijkstrom, another Swedish national, who worked as CEO of the chain until May 2, 2013.
Rimi Lietuva last year saw its audited net losses soar 2.5 times from 2011 to 4.952 million litas (EUR 1.43m). Its revenues shrank by an annual 0.3 percent to 739.553 million litas.