Born in Ljubljana, Kresal studied law at the University of Ljubljana and in 1996 graduated with honours. Firstly, she was employed as a legal trainee at the Higher Court in Ljubljana, then as a law clerk in a Commercial Disputes department at District Court in Ljubljana. Later she worked as an independent advisor for legal affairs at Kapitalska družba d.d. and afterwards as a Director of the Legal Department in Western Wireless International, Slovenian company based in Ljubljana owned by Americans. Since 2003 she worked as an attorney in law firm Miro Senica & attorneys. In 2005 she became Deputy Head of Office and Head of Commercial and International Law Department.
She entered politics in 2007, when she was elected for the president of the Liberal Democracy of Slovenia (LDS). In the Slovenian parliamentary election, 2008, she was elected to the National Assembly. On 24 November of the same year, she became Minister of Interior of the centre-left government of Borut Pahor with a handover from Dragutin Mate.
On 10 August 2011, she stepped down as a Minister of Interior due to the opinion given by the Commission for the Prevention of Corruption of the Republic of Slovenia over a lease of a building to house the Slovenian National Bureau of Investigation. In their opinion they stated that there could be some irregularities in the lease of the building. She resigned due to her own principle values although she did not agree with the opinion given by Commission for the Prevention of Corruption. Her term ended on 19 August 2011, when the National Assembly took formal note of her resignation. She did not decide to retake the post of a deputy. She stated that she would use all legally possible channels to prove that the lease was untainted.
On 15 December 2011, Kresal irrevocably resigned as the president of LDS after the party failed to secure itself the entry into the National Assembly at the 2011 Slovenian parliamentary election.
In 2012 she founded European Centre of Dispute Resolution (ECDR). ECDR offers services in various fields, with emphasis on commercial, financial, business, consumer, civil, family and employment issues. ECDR operates internationally.
On 14 March 2010, Katarina Kresal was a passenger in Audi A8 that was reported by Žurnal24 to be driving faster than 200 kilometres per hour (120 mph) towards Fernetiči and without the police lights. The road speed limit was 130 km/h (81 mph). The car stopped only after 30 km (19 mi) of car chase. The policeman who drove the car was fined with 460 euros and 6 demerit points. On 2 April 2010, the police reported the speed did not surpass 166 km/h (103 mph). Katarina Kresal said she had not been aware of the car speed.
- "Ministers Officially Take Over from Predecessors (IV)". Slovenian Press Agency. 24 November 2011.
- "Minister Kresal Chosen Woman of the Year". Slovenian Press Agency. 12 January 2010. Retrieved 12 January 2010.
- "Slovenian interior minister steps down over corruption allegations". Euinside. 17 August 2011.
- "Weekly Review of Events Involving Slovenia, 13–19 August". Slovenian Press Agency.
- Košir, Darijan (September 2011). "Tough times, tougher decisions" (PDF). Sinfo - Slovenian information. Government Communication Office (9): 5.
- Stranka LDS [@LDSstranka] (15 December 2011). "Katarina Kresal nepreklicno odstopa kot predsednica LDS" (Tweet) – via Twitter.
- "Kresalova: obžalujem hitro vožnjo" [Kresal: I regret fast driving] (in Slovenian). Žurnal24. 2 April 2010. Retrieved 3 April 2010.
- "Kresalova na Twiterju: Obžalujem ... Varnostnik je kaznovan" [Kresal on Twitter: I regret ... The security guard has been punished] (in Slovenian). 2 April 2010. Retrieved 2 April 2010.
| Minister of the Interior
24 November 2008–19 August 2011
|Party political offices|
| President of the LDS
30 June 2007–15 December 2011