Marina Medarić was born on July 26, 1966 in Rijeka. She finished elementary school in Cres and high school in Rijeka, and earned the title of foreign correspondent. She graduated in 1989 from the professional study of domestic trade at the Faculty of Economics in Rijeka. Since 1989 until 2013 she worked at the Cres Shipyard d.d. in Cres, initially as a commercial officer and then as a manager of the Maritime Transport Sector and Port Security Service. At the same time, she performs the tasks of PFSO (person in charge of security protection of the port). She was the president of the Supervisory Board for two terms.
Since 2013, she has been elected Deputy prefect of the Primorje-Gorski Kotar County, in charge of social activities, budget, finance, procurement, property management and maritime affairs. She has been a member of the City Council of Cres since 2001. until 2013, and vice president of the City Council and advisor to the mayor. Since 2001 until 2013 she was President of the Administrative Council of the County Port Authority of Cres, since 2010. until 2013 member of the Supervisory Board of the Tourist Board of the City of Cres, since 2012. until 2013 member of the Supervisory Board of Jadrolinija, and from 2013 to 2017 member of the Board of Directors of the Rijeka Port Authority. Member of the Commission of the Government of the Republic of Croatia for the boundaries of local self-government units since 2015, member of the Economic Council of the Faculty of Tourism and Hospitality Management since 2019.
Since 2014 until 2016 she was a member of the Delegation in the House of Regional Authorities of the Congress of Local and regional authorities of the Council of Europe.