Slovenská Kajňa (Hungarian: Alsónyírjes, until 1899: Tót-Kajnya) is a village and municipality in Vranov nad Topľou District in the Prešov Region of eastern Slovakia.

In historical records the village was first mentioned in 1323.

The municipality lies at an altitude of 142 metres and covers an area of 6.729 km². It has a population of about 783 people.

• Marcel Matanin is a former long-distance runner, who represented his native country in the men's marathon at the 2004 Summer Olympics in Athens, Greece. There he finished in 81st and last place, clocking a total time of 2:50:26 hours. On 23 April 2006 Matanin won the Leipzig Marathon in 2:19:33 hours. Matanin was a former mayor of Slovenská Kajňa (from 1 January 2007 to 31 December 2010). Currently he is a sporting director of the ČSOB Bratislava Marathon.
• Tomáš Oslovič is a Slovak football defender who currently plays for Landesliga Bayern-Mitte club 1. FC Bad Kötzting in Germany. His former clubs were MFK Vranov nad Topľou, Czech 1. FC Karlovy Vary and German clubs SV Schwarzhofen e.V, SV Mitterteich.

• Media related to Slovenská Kajňa at Wikimedia Commons
• Official website
• http://www.statistics.sk/mosmis/eng/run.html