Ivan Šimko (born 1 January 1955) is Slovak politician and former defense and interior affairs minister.

After a disagreement with Prime Minister Mikuláš Dzurinda, he led a group of MPs to form the Free Forum in January 2004.

He surprisingly lost the party's leadership election two months later to Zuzana Martináková, and he left in October 2004 to form Mission 21 – New Christian Democracy.

On 15 May 2023, president Zuzana Čaputová installed Šimko as Minister of Interior Affairs in her technocratic government.

On 19 July 2023, he was removed as a minister due to concerns about political interference in police work.